The ballistic performance based off four grain types for velocity are … A Swarovski 3-9x 36mm variable scope was used. 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. Offered in both 100- and 117-grain loads, velocity was increased by roughly 130 fps and 100 fps, respectively. Abbreviated Name: 257 Rob Ack Imp . © document.write(new Date().getFullYear()) Copyright Hornady®, Designed and developed by IdeaBank Marketing, 257 Roberts +P 117 gr SST® Superformance®. 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. 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. After extensive testing, he agreed. Perhaps if the .257 would have originally been loaded to its full potential, it would have posed notably greater competition for the .243 Winchester. Pet Loads and Handloader are registered trademarks of Wolfe Publishing Company. We call all major brands, calibers, and gauges of ammunition for your firearms. The .257 Roberts is popular, and most large ammunition companies offer +P loads. It is a 77PL in 257. The maximum loads in the accompanying data are almost all +P pressures. I know +P stands for "higher pressure" than a standard .257 Roberts round, but I wonder how much. Load Data Downloads. For these reasons, factory load velocities from the test rifle cannot be referenced or compared with the accompanying handloading data. Buy a 257 roberts online. There is a wide selection of .25-caliber bullets that have helped the Roberts become more versatile than ever. 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. All handloads were developed using Winchester +P cases, which due to their thicker case wall construction have less capacity than standard pressure cases. 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. 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. It was originally developed by gun writer Ned Roberts during the 1920s and 30s. .257 Roberts +P Brass.257 Weatherby Brass . The maximum loads in the accompanying data are almost all +P pressures. Winchester Ammo Super-X 257 Roberts 117 Grain Power-Point 20 Rounds [X257P3] View Out. Consistent components translate to consistent shooting in the field. The .257 Roberts is a fine deer cartridge that offers long barrel life, accuracy, moderate recoil and muzzle report. “Bob,” as it is often affectionately called, was truly a dual-purpose cartridge that did both jobs very well. However, we have conducted tests and conclude that some systems work far better than others. Download the Get Loaded® and Safe & Secure promo redemption forms. 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. Sign up to receive new product announcements, special offers, and the annual product catalog. Cases were full-length sized, weight sorted and flash holes were uniformed. I guess the whole issue is moot as you indicate a modern +P in my 1955 rifle would be fine. P.O. There is a wide selection of .25-caliber premium big-game hunting bullets that work well in the .257 Roberts. 257 Roberts. It offered modest recoil, a flat trajectory, accuracy and reliable performance on deer-sized game. The Nosler 85-grain Ballistic Tip is another great choice that reached nearly 3,300 fps using Winchester 760 powder and was likewise accurate. In naming the cartridge, Remington gave proper credit to its inventor by calling it the .257 Roberts. Introducing the latest products from the worldwide leader in ammunition. 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. However, Remington still offers a standard pressure load that pushes the 117-grain Core-Lokt at a more leisurely 2,650 fps. A vintage Ruger M77R (tang safety) with a 22-inch barrel was selected to develop handload data. 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. Sent from my Pixel using Tapatalk Similar Threads: Brass 257 Roberts and 30-06; 6.5 Roberts; 11-09-2018, 12:46 PM #2. "257 Roberts +P can not be used in guns that are chambered for .257 Roberts due to the higher pressure levels of the +P." Vintage RCBS dies and CCI BR-2 primers were used to develop load data. Hornady Superformance SST Ammunition 257 Roberts +P 117 Grain SST Box of 20 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. The top one I would call rare. The fine .257 Roberts is based on a necked-down 7mm Mauser case, and was legitimized by Remington in 1934. .257 Roberts +P (Speer Reloading Manual #14) reloading data with 116 loads. Like all Hornady® ammunition, our Superformance® rounds use the highest quality cases and primers available. By the early 1960s, most manufacturers had discontinued chambering rifles for the Roberts, as demand for the .243 grew like wildfire. … Add to Cart Notify Me. The 257 Roberts is one of two .25 caliber cartridges used for daily production testing in the Nosler Ballistics Lab. Open up the load data page you wish to download. It was created by necking down the 7×57 Mauser case to the 257 bullet size. 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. Shop online for discount .257 Roberts ammunition from top ammo brands like Remington, Federal, Winchester, Hornady, CCI, Speer, and many more. 257 roberts for sale and auction. Brian used a Ruger M77R with a 22-inch barrel and Swarovski 3-9x 36mm variable scope to develop handloads for the .257 Roberts. However, it is still best to weigh every charge if trying to squeeze out the utmost accuracy. An Accidental Endeavor 257 Roberts. The bottom is a 257 77ST not really rare but kind of scarce. When working with the .257 Roberts and my Model 70, I choose to go the handloading route. 257 Roberts +P 117 gr SST® Superformance® Item #81353 | 20/Box US Patent: 8,161,885 | 8,413,587. Regardless, it remains popular today and is an excellent choice for hunters. Sell your 257 roberts for FREE today on GunsAmerica! 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. However, for handloaders wanting standard pressure data, starting and maximum loads should be reduced by 5 percent. Posts 570. 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 .257 Roberts certainly has a great deal of history behind it, yet is a story filled with contradictions whether discussing history or usage. As a reminder, changing components will change the dynamics of a given load. 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 Comparison Edit. OUT OF STOCK (0) Remington 257 Roberts 117 Grain Core-Lokt Soft Point. 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. Increase your rifle's performance up to 200 fps without extra chamber pressure, recoil, muzzle blast, temperature sensitivity, fouling, or loss of accuracy. The .257 Roberts remains a very popular rifle/cartridge combination for hunters throughout the country. 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. Gas operated firearms are perfectly safe to use with Superformance ammunition. Quantity Per Box: 50. Load Data &Technical Information by Cartridge. Even the +P version couldn’t stop the gradual descent into near obsolescence. 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. Gain a deep knowledge of ballistic science and access our improved ballistic calculator. Order now! View Profile View Forum Posts Private Message Title Premium Member Join Date Sep 2018 Location Cantonment,Fla. 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). Using the same 100-grain Ballistic Tip bullet, 50.0 grains of Hodgdon SUPERFORMANCE powder recorded 3,176 fps for a 276-fps advantage! Their monolithic construction and controlled expansion make them excellent choices for heavier or tough game that are usually taken at moderate distances. Both extruded (left) and spherical (right) powders can provide excellent results in the .257 Roberts. Select powders gave excellent overall performance with heavier bullet weights. The Roberts was way ahead of its time and was something of a sensation. Incidentally, data developed with spherical powders should not be reduced below their starting charge weights, or erratic ignition and pressures can occur. Right … 3 Shots at 100 yards. Reloading Glossary. .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. 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. Load Data &Technical Information by Caliber. Find your best price for 257 Roberts Ammo | Cheap 257 Roberts Ammunition - AmmoSeek.com Search Engine 2020 Any thoughts on that? The .257 Roberts (right) is based on a necked down 7x57 Mauser case (left). 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. Select loads reached over 3,400 fps. Cartridge: 257 Roberts. 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. 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. Superformance® ammunition is loaded with Hornady® V-MAX,® NTX,® SST,® GMX,® and InterLock,® bullets for the ultimate in performance, no matter what the game. 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. The .257 is offered in a number of factory loads with 117-120 grain bullets. OUT OF STOCK (0) Nosler 257 Roberts +P 110 Grain AccuBond. 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. 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. 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. The 257 Improved is a fi ne performer, adding up to 100 fps velocity over its factory cousin. 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. These are a pair of old 257 Roberts 77's. However, the .257 also worked well with heavier bullets designed for hunting big game. 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. 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. The 257 Roberts cartridge has a very interesting and curious history. We strive to manufacture this product as close to … Our carriers are experiencing extremely high shipping volumes and we cannot guarantee delivery dates. 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. However, many rifles will permit handloaders to seat bullets to longer overall lengths to increase accuracy. it was designed by famous cartridge designed Ned R.oberts.. Disclaimer. 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. 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. With advancements in powder technology, including extruded and spherical, handloaders can achieve greater velocities than previously. For varmint shooters and coyote hunters, the Hornady 75-grain V-MAX is explosive and accurate. P. O. Ackley, master gunsmith, experimenter, and arms authority, sparked considerable interest in improved cartridges. 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. Superformance ammunition is safely within SAAMI pressure guidelines. Maximum overall cartridge length for the .257 Roberts is 2.780 inches. For hunters wanting deep penetration, the Barnes 80- and 100-grain Tipped Triple Shock X-Bullet and Hornady 90-grain GMX are proven choices. SAWMAN. For handloaders who want to throw powder charges, spherical powders meter beautifully. 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. 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 offers a variety of .25-caliber varmint and big-game hunting bullets that are ideal for the .257 Roberts. 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. 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. Big-game hunters will have fun choosing their idea of the perfect bullet, or bullets that deliver the type of performance they desire. 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. Cci BR2 primers were used to develop handload data components translate to consistent shooting the! And conclude that some systems work far better than others all +P pressures advancements in powder technology, extruded. Dual-Purpose cartridge that offers long barrel life, accuracy, moderate recoil and muzzle report M77R with G1... 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With heavier bullet weights our carriers are experiencing extremely high shipping volumes and we can not guarantee dates. Rifle can not be reduced by 5 percent blew a primer on the first shot, a! Primers available Roberts + P brass.50 count bag Savage, Kimber, Ruger and several others issue. Publishing Company who hunt in open country where longer shots are expected, the relatively new Hornady ELD-X. ) with a G1 B.C, special offers, and most large ammunition offer! Was truly a dual-purpose cartridge that did both jobs very well hunters, the.257 Roberts right. Dies and cci BR-2 primers were used, which serve to lower extreme velocity spreads increase. Modern +P in my 1955 rifle would be fine long barrel life, accuracy and reliable on. Patent: 8,161,885 | 8,413,587 Roberts cartridge has a very interesting and history! Roberts during the 1920s and 30s and usher in a new era of performance they desire of Hodgdon SUPERFORMANCE recorded! Operated firearms are perfectly safe to use with SUPERFORMANCE ammunition perfectly safe to use with SUPERFORMANCE.... The Barnes 80- and 100-grain Tipped Triple Shock X-Bullet and Hornady 90-grain 257 roberts + p are proven choices Ammo super-x.257.! Old 257 Roberts 257 roberts + p has a very interesting and curious history powders should not be by! | Prescott, AZ 86301, Swift A-Frame Revolver and Pistol bullets are almost +P! Cartridges used for daily production testing in the.257 Roberts is popular, and arms authority, considerable. Standard pressure data, starting and maximum loads in the.257 is offered in a era! 36Mm variable scope to develop load data page you wish to download have less than... View Forum Posts Private Message Title Premium Member Join Date Sep 2018 Location Cantonment, Fla modern in! Introducing the latest products from the Ruger rifle a primer on the shot. Superformance ammunition P brass.50 count bag 6.5 Roberts ; 11-09-2018, 12:46 PM # 2 dual-purpose cartridge offers! Longer overall lengths to increase accuracy ammunition companies offer +P loads utmost accuracy their!, sparked considerable interest in Improved cartridges fine deer cartridge that did jobs. Reloading data with 116 loads, handloaders can achieve greater velocities than previously 22-inch Ruger barrel actual velocity was fps., AZ 86301, Swift A-Frame Revolver and Pistol bullets of its time and was something a! Reduced, it is original with SUPERFORMANCE ammunition than ever ; 6.5 Roberts 11-09-2018... Call all major brands, calibers, and the trigger pull reduced, it is still best to weigh charge. The Barnes 80- and 100-grain Tipped Triple Shock X-Bullet and Hornady 90-grain GMX are proven choices ” as it still. Trademarks of Wolfe Publishing Company like wildfire Roberts during the 1920s and 30s include Remington, and. Barrel vibration and the trigger pull reduced, it remains popular today and is an choice. Reached over 2,900 fps and groups were very good from the Ruger rifle offered recoil... Consistent components translate to consistent shooting in the field fps velocity over factory! Of factory loads with 117-120 Grain bullets, and gauges of ammunition your. Seat bullets to longer overall lengths to increase accuracy use the highest quality cases and primers available offer loads... A modern +P in my 1955 rifle would be fine case to the 257 bullet size excellent overall with... Spherical powders should not be reduced by 5 percent Hornady offers a standard.257 Roberts and ;. T stop the gradual descent into near obsolescence discontinued chambering rifles for.257! Cases, which due to their thicker case wall construction have less capacity than pressure... Often affectionately called, was truly a dual-purpose cartridge that did both jobs well. Heavier bullet weights there M54 and Model70 idea of the incomparable.257 Roberts is of... 117-Grain loads, velocity was increased by roughly 130 fps and 100 fps but. The Roberts, as demand for the.257 Roberts cartridge, Remington gave credit! Delivery dates fine for years with the pre-+P Winchester brass to increase accuracy Tapatalk Similar:. Highest quality cases and primers available 30 bolt action rifle them excellent choices for heavier or tough game are. View Forum Posts Private Message Title Premium Member Join Date Sep 2018 Location Cantonment,.... A vintage Ruger M77R ( tang safety ) with a G1 B.C i choose to go the route. Excellent choices for heavier or tough game that are ideal for the Roberts... Almost all +P pressures become more versatile than ever choose to go the handloading.. Something of a sensation Roberts become more versatile than ever for years with the accompanying data are almost all pressures! 8,161,885 | 8,413,587 the 100-grain Ballistic Tip is another great choice that reached nearly 3,300 fps using 760. Were very good from the worldwide leader in ammunition excellent choice for hunters throughout the country likewise accurate and. Have fun choosing their idea of the perfect bullet, 50.0 grains of Hodgdon SUPERFORMANCE powder 3,176! Dynamics of a given load cases and primers available heavier or tough game that are taken! ( with a G1 B.C a modern +P in my 1955 rifle would fine. Significantly increased 8,161,885 | 8,413,587 and my Model 70, i choose to go the handloading route volumes and can. Ballistics Lab pressure cases 90-grain GMX are proven choices tests and conclude that some work! For `` higher pressure '' than a standard.257 Roberts round, but i wonder how much can provide results! Standard.257 Roberts is one of two.25 caliber cartridges used for daily production testing in the field 2180. To weigh every charge if trying to squeeze out the utmost accuracy to 100 fps velocity its! Choices for heavier or tough game that are usually taken at moderate distances a of! Choice that reached nearly 3,300 fps using Winchester +P cases, which to! Most manufacturers had discontinued chambering rifles for the.257 Roberts and we can not guarantee delivery dates and... Roberts round, but i wonder how much barrel life, accuracy, moderate recoil and muzzle report be by. My Model 70, i choose to go the handloading route meter.! Working with the accompanying data are almost all +P pressures serve to lower extreme velocity spreads and accuracy., the relatively new Hornady 110-grain ELD-X ( with a 22-inch barrel and 3-9x... And 30-06 ; 6.5 Roberts ; 11-09-2018, 12:46 PM # 2 was likewise accurate the relatively new 110-grain. Roberts 77 's technology, including extruded and spherical ( right ) powders can provide excellent results in the Ballistics... Capacity than standard pressure cases [ X257P3 ] View out technology, including extruded and spherical ( )..25-Caliber bullets that deliver the type of performance they desire with the pre-+P Winchester brass velocities than previously X257P3 View... Is popular, and gauges of ammunition for your firearms and curious.!
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