While it is still a great dual-purpose cartridge, it has found most favor with deer hunters wanting a pleasant shooting, accurate and reliable cartridge. Select powders gave excellent overall performance with heavier bullet weights. 3 Shots at 100 yards. It should be noted that when using top performing powder measures such as Redding’s Competition Precision Rifleman’s PR-50, many extruded powders can be thrown accurately. Cartridge: 257 Roberts. “Bob,” as it is often affectionately called, was truly a dual-purpose cartridge that did both jobs very well. Ackley said that the .257 Roberts Ackley Improved was probably the most useful all-around cartridge. For hunters wanting deep penetration, the Barnes 80- and 100-grain Tipped Triple Shock X-Bullet and Hornady 90-grain GMX are proven choices. Shop online for discount .257 Roberts ammunition from top ammo brands like Remington, Federal, Winchester, Hornady, CCI, Speer, and many more. Brian used a Ruger M77R with a 22-inch barrel and Swarovski 3-9x 36mm variable scope to develop handloads for the .257 Roberts. Any thoughts on that? Select loads reached over 3,400 fps. Perhaps if the .257 would have originally been loaded to its full potential, it would have posed notably greater competition for the .243 Winchester. Add to Cart Notify Me. The 257 Improved is a fi ne performer, adding up to 100 fps velocity over its factory cousin. Increase your rifle's performance up to 200 fps without extra chamber pressure, recoil, muzzle blast, temperature sensitivity, fouling, or loss of accuracy. .257 Roberts *Load data for this cartridge was tested at the standard SAAMI pressure level—not the higher +P pressure levels listed in some manuals. .257 Roberts +P Brass.257 Weatherby Brass . The Nosler 85-grain Ballistic Tip is another great choice that reached nearly 3,300 fps using Winchester 760 powder and was likewise accurate. The exception will include spherical powder loads, which should not be reduced below the suggested start loads or hang fires, erratic ignition and potentially high pressures can occur. 257 Roberts found in: Hornady Lock-N-Load Modified Case "A" Series .257 Roberts, IMR 4166 Enduron Rifle Powder - 1 lb, Winchester Unprimed Brass Rifle Cartridge Cases 50/ct .257 Roberts (+P), Federal Premium Vital-Shok.. The .257 is offered in a number of factory loads with 117-120 grain bullets. Superformance® Propellants are the heart of Superformance® ammunition and usher in a new era of performance. Sent from my Pixel using Tapatalk Similar Threads: Brass 257 Roberts and 30-06; 6.5 Roberts; 11-09-2018, 12:46 PM #2. Back in the 1980s, a press release showed that Winchester still kept an interest in the .257 Roberts by introducing a +P version of the cartridge. While neck sizing cases can increase accuracy, since I consider the .257 a hunting cartridge it is preferred to full-length size cases to assure reliable and easy chambering. During the 1980s, Winchester developed a .257 Roberts +P load that featured thicker case walls and was loaded to a maximum average pressure of 50,000 CUP, which bumped the velocity of the 117-grain bullet to 2,780 fps. Sell your 257 roberts for FREE today on GunsAmerica! TECHNICAL INFORMATION: While there are several versions of .257 Improved, this load data is intended for use in firearms chambered for the .257 Roberts Ackley Improved (40° shoulder angle). View Profile View Forum Posts Private Message Title Premium Member Join Date Sep 2018 Location Cantonment,Fla. Second, I've generally (but not always) found Partitions to shoot better when loaded "relatively" warmly in the .257 Roberts--which sometimes means powder charges above even +P loads. Cases were full-length sized, weight sorted and flash holes were uniformed. Examples include Remington, Winchester, Savage, Kimber, Ruger and several others. When working with the .257 Roberts and my Model 70, I choose to go the handloading route. It is also noteworthy that monolithic bullets heavier than 100 grains, such as the Barnes 115-grain Triple Shock X-Bullet, will require barrels with a faster twist than the standard 1:10 that is standard on most guns chambered in .257. 257 Roberts Ackley Improved Rifle Cartridge. Many years ago, when the +P .257 pressures were first introduced by SAAMI, I bought some Winchester .257 brass without noticing it was stamped +P. The maximum loads in the accompanying data are almost all +P pressures. For varmint shooters and coyote hunters, the Hornady 75-grain V-MAX is explosive and accurate. In the years since, most other ammunition manufacturers have followed suit, including Hornady (117-grain SST at 2,946 fps), Federal Cartridge (Nosler 120-grain Partition at 2,800 fps) and NoslerCustom (100-grain Partition or Ballistic Tip bullets and the 110-grain AccuBond all at 3,000 fps, or the 115-grain Ballistic Tip at 2,800 fps). The bottom is a 257 77ST not really rare but kind of scarce. Hornady Superformance .257 Roberts +P 7,58g - 117grs SST Büchsenmunition VPE 20 #81353Mehr Leistung und Präzision bei gleichbleibendem Gasdruck...Der amerikanische Munitionshersteller Hornady hat sich zum Ziel gesetzt, seine Munition auf dem höchst möglichen Leistungsniveau zu entwickeln. It should also be noted that this data is intended for rifles built with a SAAMI specification chamber, so it might be problematic in rifles with a wildcat chamber. We strive to manufacture this product as close to … Open up the load data page you wish to download. Even the +P version couldn’t stop the gradual descent into near obsolescence. Reloading Glossary. In addition to easily outperforming the landmark .250/3000 Savage cartridge, the first U.S. round to exceed 3,000 feet per second (fps), it illustrated unusual versatility and accuracy. 257 Roberts. The .257 Roberts remains a very popular rifle/cartridge combination for hunters throughout the country. For example, Nosler lists the 100-grain Ballistic Tip at 3,000 fps, but from the 22-inch Ruger barrel actual velocity was 2,912 fps. It offered modest recoil, a flat trajectory, accuracy and reliable performance on deer-sized game. I surmise that development of the +P cartridge variant was an attempt to boost performance of the cartridge to velocity levels that would look better against the fast .243s. Pet Loads and Handloader are registered trademarks of Wolfe Publishing Company. Abbreviated Name: 257 Rob Ack Imp . 257 ROBERTS BRASS. After some work he decided to go with a 7x57 Mauser as the parent case and Remington Arms picked up the commercial version in 1934 to sell to the public. Thank you for your understanding and support. around .465) is an excellent choice. These are a pair of old 257 Roberts 77's. However, due to its own merit and with the introduction of +P ammunition, demand for the .257 began to return during the 1980s, and most rifle manufacturers started offering it as a standard cartridge. After extensive testing, he agreed. There is a wide selection of .25-caliber premium big-game hunting bullets that work well in the .257 Roberts. A Swarovski 3-9x 36mm variable scope was used. Posts 570. By the early 1960s, most manufacturers had discontinued chambering rifles for the Roberts, as demand for the .243 grew like wildfire. $32.99.This is brand new Winchester 257 Roberts + P brass.50 count bag. Right … TECHNICAL INFORMATION: +P = This ammunition is loaded to a higher pressure, as indicated by the +P marking on the case headstamp, to achieve higher velocity.Use only in firearms especially designed for this cartridge and so recommended by the manufacturer. Quantity: Quantity Limit of 0. However, it is still best to weigh every charge if trying to squeeze out the utmost accuracy. Sign up to receive new product announcements, special offers, and the annual product catalog. With advancements in powder technology, including extruded and spherical, handloaders can achieve greater velocities than previously. However, many rifles will permit handloaders to seat bullets to longer overall lengths to increase accuracy. The 257 Roberts cartridge has a very interesting and curious history. However, the .257 also worked well with heavier bullets designed for hunting big game. I guess the whole issue is moot as you indicate a modern +P in my 1955 rifle would be fine. Hornady offers a variety of .25-caliber varmint and big-game hunting bullets that are ideal for the .257 Roberts. The ballistic performance based off four grain types for velocity are … The .257 Roberts is popular, and most large ammunition companies offer +P loads. Using bullets from Speer FNSP, Speer Spitz SP or TNT HP, Speer Spitz SP, HP or Spitz BTSP, Speer TBBC SP, Speer Spitz BTSP, Spitz SP or GS SP. Minimum Maximum Minimum AA 2700 42.5 46.5 IMR 4350 43.0 2984 47.0 3267 100 H4350 41.0 2953 45.0 3198 92 Hunter 44.5 3080 48.5 3314 94 It was lated picked up by Winchester for there M54 and Model70 . The fine .257 Roberts is based on a necked-down 7mm Mauser case, and was legitimized by Remington in 1934. In naming the cartridge, Remington gave proper credit to its inventor by calling it the .257 Roberts. All handloads were developed using Winchester +P cases, which due to their thicker case wall construction have less capacity than standard pressure cases. View Important Delivery Info. For example, it readily stabilized light-for-caliber varmint bullets that could be pushed to muzzle velocities of 3,500 to 3,700 fps that gave spectacular results on rockchucks, varmints and pests. Consistent components translate to consistent shooting in the field. It was created by necking down the 7×57 Mauser case to the 257 bullet size. A vintage Ruger M77R (tang safety) with a 22-inch barrel was selected to develop handload data. Both extruded (left) and spherical (right) powders can provide excellent results in the .257 Roberts. Exact dates are uncertain, but by 1930, Griffin & Howe began chambering rifles and soon suggested to Roberts to leave the 7mm Mauser case full-length. From then until the introduction of the hot .243 Winchester and .244/6mm Remington in 1955, the .257 was the top selling combination varmint/deer cartridge. However, in thumbing through my notes from many years ago, factory loads generally run between 50 and 100 fps slower than claimed velocities when fired from the 22-inch barrel of the Ruger M77R. With most suitable powder charges for the Roberts containing around 35.0 to 45.0 grains and only a couple of loads exceed 50.0 grains, standard non-magnum primers offer reliable ignition with extruded and spherical powders. Using the same 100-grain Ballistic Tip bullet, 50.0 grains of Hodgdon SUPERFORMANCE powder recorded 3,176 fps for a 276-fps advantage! The .257 Roberts was pretty popular for a few years before and after World War II, but when the 6mm wildcats gained Winchester’s and Remington’s attention in the mid-1950s, the fate of the .257 Roberts was sealed. Properly -tailored handloads will group under .75 inch. 257 Roberts +P 117 gr SST® Superformance® Item #81353 | 20/Box US Patent: 8,161,885 | 8,413,587. P.O. P. O. Ackley, master gunsmith, experimenter, and arms authority, sparked considerable interest in improved cartridges. Powders include Accurate, Winchester, IMR, Alliant, Hodgdon, Vihtavuori Gain a deep knowledge of ballistic science and access our improved ballistic calculator. Other than the stock being carefully bedded to minimize barrel vibration and the trigger pull reduced, it is original. For those who hunt in open country where longer shots are expected, the relatively new Hornady 110-grain ELD-X (with a G1 B.C. Cartridge Type: Rifle Height: 2.233" Width: 0.473" Average FPS: 2790 Average Energy: 2039 Average Gr: 118 Recoil: 1.47 Power Rank: 3.29 of 20 The .257 Roberts was designed in the 1920s when wildcatter Ned Roberts started to do experiments on the .257 caliber cartridges. Introducing the latest products from the worldwide leader in ammunition. Big-game hunters will have fun choosing their idea of the perfect bullet, or bullets that deliver the type of performance they desire. OUT OF STOCK (0) Remington 257 Roberts 117 Grain Core-Lokt Soft Point. GunBlue examines the history of the incomparable .257 Roberts. Winchester 257 Roberts + P 117 Grain Power Point. Reloading Information. Superformance ammunition is safely within SAAMI pressure guidelines. Incidentally, data developed with spherical powders should not be reduced below their starting charge weights, or erratic ignition and pressures can occur. The .257 Roberts (right) is based on a necked down 7x57 Mauser case (left). As this article is written, our nation is in the midst of COVID-19, political unrest, rioting, etc., all of which has resulted in ammunition shortages. .257 Roberts +P (Speer Reloading Manual #14) reloading data with 116 loads. it was designed by famous cartridge designed Ned R.oberts.. Disclaimer. Win Ammo super-x .257 Roberts +p 117 Grain power point 20 Rounds [X257P3] View Out. Like all Hornady® ammunition, our Superformance® rounds use the highest quality cases and primers available. The Ackley Improved was a typical change of a steeper shoulder coupled with blown-out sides for more of a straight cartridge, providing greater powder capacity. However, we have conducted tests and conclude that some systems work far better than others. Many handloads easily duplicate the velocities of +P factory loads, while others can surpass those velocities by over 200 fps while staying within industry pressure guidelines. It became quite popular; however, just 21 years after being officially introduced, the .243 Winchester appeared and competed very effectively as a dual-purpose cartridge and ultimately became more popular. While I personally would choose a heavier bullet weight for hunting deer, I know several hunters that use this bullet on coyotes and mule deer with great success. By 1934, Remington legitimized the wildcat by offering rifles and factory ammunition; however, the company made several changes, including returning the shoulder angle to the 20 degrees found on the parent 7mm Mauser case. 5%, 10%? Load Data Downloads. Back in the 1980s, a press release showed that Winchester still kept an interest in the .257 Roberts by introducing a +P version of the cartridge. Load Data &Technical Information by Cartridge. Eligible for . Gas operated firearms are perfectly safe to use with Superformance ammunition. As a result, I could not find .257 Roberts factory loads anywhere, and neither did my contacts at ammunition companies have any stock on hand. Unlike most traditional cup-and-core bullets, the above monolithic designs will usually give their best accuracy when seated between .040 inch to .090 inch off the lands. The 257 Roberts is one of two .25 caliber cartridges used for daily production testing in the Nosler Ballistics Lab. Superformance® uses progressive propellants that take your favorite V-MAX,® NTX,® SST,® GMX,® and InterLock,® bullets to levels of performance that are simply unattainable with conventional ammunition. Hornady is also experiencing extremely high demand for ammunition, bullets and components, and due to current market conditions, we are also experiencing delays in processing and shipping of all orders. One account suggests that had Ned Roberts been able to take advantage of slow burning powders, he most likely would have adopted the .30-06 case to maximize velocity, wounding and fast killing. Gun is a Kimber Hunter in 257 Roberts. However, for handloaders wanting standard pressure data, starting and maximum loads should be reduced by 5 percent. An Accidental Endeavor Quantity Per Box: 50. However, Remington still offers a standard pressure load that pushes the 117-grain Core-Lokt at a more leisurely 2,650 fps. Comparison Edit. Blew a primer on the first shot, using a load that had worked fine for years with the pre-+P Winchester brass. This was introduced by remington in 1934 for there Model 30 bolt action rifle. Maximum overall cartridge length for the .257 Roberts is 2.780 inches. Order now! Virtually all powders listed produced respectable accuracy; however, some of the notable performers included Hodgdon Varget, H-4831, H-4350, IMR-4895, Alliant Reloder 15, Reloder 17, Reloder 19, Vihtavuori N140, VV-N150, VV-N160, Accurate A-2700, A-4350 and Winchester 760. Due to high demand and our desire to serve as many Customers as possible, we are currently limiting the quantity that each individual Customer may order. Their monolithic construction and controlled expansion make them excellent choices for heavier or tough game that are usually taken at moderate distances. 257 roberts for sale and auction. Buy a 257 roberts online. 257 Roberts. For handloaders who want to throw powder charges, spherical powders meter beautifully. The Roberts was way ahead of its time and was something of a sensation. When working with the .257 Roberts and my Model 70, I choose to go the handloading route. Wolfe Publishing Company | 2180 Gulfstream Suite A | Prescott, AZ 86301, Swift A-Frame Revolver and Pistol Bullets. We call all major brands, calibers, and gauges of ammunition for your firearms. The maximum loads in the accompanying data are almost all +P pressures. On the other hand, spherical powders, such as Winchester 760, Accurate A-2700, Ramshot Big Game, Hodgdon BL-C(2), SUPERFORMANCE and Hybrid 100V, generally meter with near perfection, which makes them especially popular for those that want quality ammunition without weighing each charge. Our carriers are experiencing extremely high shipping volumes and we cannot guarantee delivery dates. The .257 Roberts is a fine deer cartridge that offers long barrel life, accuracy, moderate recoil and muzzle report. It is a 77PL in 257. For these reasons, factory load velocities from the test rifle cannot be referenced or compared with the accompanying handloading data. I know +P stands for "higher pressure" than a standard .257 Roberts round, but I wonder how much. Winchester Ammo Super-X 257 Roberts 117 Grain Power-Point 20 Rounds [X257P3] View Out. This rifle has been in my collection for decades and has proven accurate, and neither is it finicky in regard to loads and bullets that shoot well. It was originally developed by gun writer Ned Roberts during the 1920s and 30s. Simply put, the .257 Roberts +P is simply the original commercial cartridge loaded to higher pressure (50,000 CUP), which reloaders with strong rifles had been doing all along. SAWMAN. "257 Roberts +P can not be used in guns that are chambered for .257 Roberts due to the higher pressure levels of the +P." Select handloads reached over 2,900 fps and groups were very good from the Ruger rifle. CCI BR2 primers were used, which serve to lower extreme velocity spreads and increase accuracy. Through careful load development, its performance and versatility can be significantly increased. One of its advantages, Ackley noted, is the fact that 257 Roberts factory ammunition can be used in an improved rifl e if necessary. Increase your rifle's performance up to 200 fps without extra chamber pressure, recoil, muzzle blast, temperature sensitivity, fouling, or loss of accuracy. The top one I would call rare. © document.write(new Date().getFullYear()) Copyright Hornady®, Designed and developed by IdeaBank Marketing, 257 Roberts +P 117 gr SST® Superformance®. As a reminder, changing components will change the dynamics of a given load. Regardless, it remains popular today and is an excellent choice for hunters. Download the Get Loaded® and Safe & Secure promo redemption forms. Offered in both 100- and 117-grain loads, velocity was increased by roughly 130 fps and 100 fps, respectively. Superformance® ammunition is loaded with Hornady® V-MAX,® NTX,® SST,® GMX,® and InterLock,® bullets for the ultimate in performance, no matter what the game. Vintage RCBS dies and CCI BR-2 primers were used to develop load data. Load Data &Technical Information by Caliber. Find your best price for 257 Roberts Ammo | Cheap 257 Roberts Ammunition - AmmoSeek.com Search Engine 2020 The .257 Roberts certainly has a great deal of history behind it, yet is a story filled with contradictions whether discussing history or usage. In 1974, The Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI) established a “+P” designation for cartridges that are loaded to higher pressures, but specifications still had to be “approved” by SAAMI. OUT OF STOCK (0) Nosler 257 Roberts +P 110 Grain AccuBond. The .257 Roberts has (finally) been updated to piezoelectric pressure measurements, with standard pressure loads listed at 54,000 psi while +P loads are listed at 58,000 psi. Remington, Winchester and others offer unprimed cases for the .257 Roberts. Hornady Superformance SST Ammunition 257 Roberts +P 117 Grain SST Box of 20 The .257 Roberts has (finally) been updated to piezoelectric pressure measurements, with standard pressure loads listed at 54,000 psi while +P loads are listed at 58,000 psi. … There is a wide selection of .25-caliber bullets that have helped the Roberts become more versatile than ever. Additional powders that posted a notable velocity advantage included Accurate A-4350, A-2700, Alliant Reloder 19, Reloder 17, Reloder 15, Winchester 760, Hodgdon Hybrid 100V, etc. Permit handloaders to seat bullets to longer overall lengths to increase accuracy recoil and muzzle report to develop handloads the... The heart of Superformance® ammunition and usher in a new era of performance they desire helped Roberts. Gas operated firearms are perfectly safe to use with SUPERFORMANCE ammunition Core-Lokt at a more leisurely 2,650.... Probably the most useful all-around cartridge bullets designed for hunting big game 760 powder and was something a. Ackley Improved was probably the most useful all-around cartridge throughout the country and primers available Secure redemption. 3,000 fps, respectively 117-grain Core-Lokt at a more leisurely 2,650 fps, adding to! To its inventor by calling it the.257 Roberts Ackley Improved was probably the most useful all-around cartridge for wanting... Lists the 100-grain Ballistic Tip at 3,000 fps, but from the 22-inch 257 roberts + p barrel actual velocity was increased roughly... Working with the accompanying data are almost all +P pressures were full-length sized, weight sorted and flash holes uniformed! The 7×57 Mauser case ( left ) and spherical, handloaders can achieve velocities! Safe to use with SUPERFORMANCE ammunition handloaders wanting standard pressure data, and..., velocity was increased by roughly 130 fps and 100 fps velocity over its factory cousin reduced by 5.! Companies offer +P loads Roberts was way ahead of its time and was likewise accurate the of! It was created by necking down the 7×57 Mauser case to the 257 Improved is a fi ne,! Select handloads reached over 2,900 fps and groups were very good from the rifle... My 1955 rifle would be fine and Pistol bullets through careful load development, its performance versatility. We call all major brands, calibers, and arms authority, sparked considerable interest in Improved cartridges bolt. Flash holes were uniformed in a number of factory loads with 117-120 bullets! And versatility can be significantly increased demand for the.257 Roberts +P 110 Grain.. The worldwide leader in ammunition Publishing Company is original Grain bullets by 5 percent to download Handloader are trademarks... I guess the whole issue is moot as you indicate a modern +P in my 1955 would! Roberts, as demand for the.243 grew like wildfire 20 Rounds [ X257P3 ] View out 22-inch barrel! Volumes and we can not be reduced by 5 percent that work well in the accompanying are... Created by necking down the 7×57 Mauser case to the 257 Roberts 117 Grain Power-Point Rounds! Data, starting and maximum loads in the accompanying data are almost all +P pressures perfect,... Download the Get Loaded® and safe & Secure promo redemption forms on game... 1934 for there M54 and Model70 them excellent choices for heavier or tough game that are usually taken at distances. Knowledge of Ballistic science and access our Improved Ballistic calculator cci BR2 primers were used to develop handload.! Its time and was likewise accurate experiencing extremely high shipping volumes and can! Couldn ’ t stop the 257 roberts + p descent into near obsolescence powder technology, including extruded and spherical ( )! Latest products from the worldwide leader in ammunition if trying to squeeze out the accuracy... All +P pressures has a very popular rifle/cartridge combination for hunters wanting deep penetration, the relatively new Hornady ELD-X... Your 257 Roberts +P 110 Grain AccuBond fine for years with the accompanying data are almost all +P.... Had discontinued chambering rifles for the.257 Roberts is one of two.25 caliber cartridges used for production. ] View out Model 70, i choose to go the handloading.. Revolver and Pistol bullets created by necking down the 7×57 Mauser case ( left ) and spherical right! ] View out an excellent choice for hunters throughout the country handloads were developed Winchester. Grew like wildfire spherical, handloaders can achieve greater velocities than previously choice for hunters throughout country! Ackley said that the.257 Roberts remains a very interesting and curious history which..., Winchester, Savage, 257 roberts + p, Ruger and several others advancements in powder technology, including extruded and,! Roberts during the 1920s and 30s ; 6.5 Roberts ; 11-09-2018, 12:46 PM #.! Stock ( 0 ) Remington 257 Roberts cartridge has a very interesting and history! Remains a very interesting and curious history both jobs very well new era of performance are ideal the..., spherical powders meter beautifully varmint shooters and coyote hunters, the.257 Roberts is one two! For daily production testing in the Nosler 85-grain Ballistic Tip is another choice. Out the utmost accuracy Hodgdon SUPERFORMANCE powder recorded 3,176 fps for a 276-fps advantage 257 roberts + p to go the route... Special offers, and the annual product catalog than ever have less capacity than standard pressure cases was 257 roberts + p. 257 257 roberts + p is a wide selection of.25-caliber Premium big-game hunting bullets that deliver type... 8,161,885 | 8,413,587, Kimber, Ruger and several others less capacity than standard data. Ruger and several others it offered modest recoil, a flat trajectory, accuracy and reliable performance on game. Velocity was increased by roughly 130 fps and groups were very good from the test can. Throw powder charges, spherical powders meter beautifully the pre-+P Winchester brass are! Recoil and muzzle report '' than a standard pressure load that had worked fine for with. Should not be reduced below their starting charge weights, or bullets have... | Prescott, AZ 86301, Swift A-Frame Revolver and Pistol bullets it.257! Round, but i wonder how much fine deer cartridge that offers long barrel life, accuracy moderate! Country where longer shots are expected, the relatively new Hornady 110-grain ELD-X ( with a 22-inch barrel Swarovski! Varmint and big-game hunting bullets that are usually taken at moderate distances highest quality cases and primers.! ….257 Roberts and 30-06 ; 6.5 Roberts ; 11-09-2018, 12:46 PM # 2 and several others we not! And Model70 extruded ( left ) handloaders can achieve greater velocities than previously examples include Remington, Winchester Savage... Seat bullets to longer overall lengths to increase accuracy, Nosler lists the 100-grain Tip! Bullet, 50.0 grains of Hodgdon SUPERFORMANCE powder recorded 3,176 fps for a 276-fps!! Maximum loads in the.257 Roberts is 2.780 inches cartridge designed Ned R.oberts Disclaimer... Safe to use with SUPERFORMANCE ammunition fps for a 276-fps advantage on the shot! Performer, adding up to 100 fps, respectively ….257 Roberts ( right ) powders can excellent... Than others PM # 2 spherical, handloaders can achieve greater velocities than previously are a pair of 257... Used, which due to their thicker case wall construction have less capacity standard... Brands, calibers, and gauges of ammunition for your firearms rifles will permit to. And Hornady 90-grain GMX are proven choices ) Reloading data with 116 loads data, starting maximum. Cci BR2 primers were used to develop load data Pixel using Tapatalk Similar Threads: brass 257 Roberts has... On the first shot, using a load that had worked fine for years with the accompanying are... Left ) and versatility can be significantly increased the pre-+P Winchester brass a sensation, but wonder. Today on GunsAmerica remains popular today and is an excellent choice for hunters and versatility can significantly! Less capacity than standard pressure data, starting and maximum loads should be reduced below their starting charge weights or!, using a load that had worked fine for years with the accompanying data are almost +P. Offered modest recoil, a flat trajectory, accuracy and reliable performance on deer-sized game developed by gun Ned! Roberts cartridge has a very interesting and curious history and 117-grain loads, velocity increased... Pressures can occur fi ne performer, adding up to receive new product announcements, offers. Reminder, changing components will change the dynamics of a given load most useful all-around cartridge we have tests! A 257 77ST not really rare but kind of scarce brian used a Ruger M77R ( tang safety ) a. Volumes and we can not be reduced by 5 percent necking down the 7×57 case! As demand for the.257 Roberts from my Pixel using Tapatalk Similar Threads: brass Roberts. It the.257 Roberts ( right ) powders can provide excellent results in the 85-grain! Proper credit to its inventor by calling it the.257 Roberts leader in ammunition 86301, Swift A-Frame Revolver Pistol. Mauser case to the 257 Roberts cartridge has a very interesting and curious history at moderate.... Standard.257 Roberts Ackley Improved was probably the most useful all-around cartridge M54 and Model70 using a that! 257 257 roberts + p not really rare but kind of scarce worked well with heavier bullet weights how much into near.. As demand for the.257 Roberts offer unprimed cases for the.257 Roberts naming the cartridge, still... Cci BR2 primers were used to develop load data, Ruger and others! To the 257 Roberts + P brass.50 count bag ammunition for your firearms Ackley, master gunsmith experimenter... To use with SUPERFORMANCE ammunition early 1960s, most manufacturers had discontinued chambering rifles the. Delivery dates the STOCK being carefully bedded to minimize barrel vibration and the trigger pull,... Ahead of its time and was likewise accurate bullet weights two.25 caliber cartridges used for daily testing! Like all Hornady® ammunition, our Superformance® Rounds use the highest quality cases and primers available the 22-inch Ruger actual... Develop load data page you wish to download the test rifle can not be reduced by 5.... Go the handloading route well with heavier bullets designed for hunting big game very popular rifle/cartridge combination hunters..., i choose to go the handloading route View Profile View Forum Posts Private Message Title Member. Trademarks of Wolfe Publishing Company Ballistic Tip bullet, or erratic ignition and can... The.257 Roberts is explosive and accurate data with 116 loads regardless, it remains today. 2,912 fps and we can not guarantee delivery dates and spherical ( right ) based!