Buy a 257 roberts online. View Important Delivery Info. One of its advantages, Ackley noted, is the fact that 257 Roberts factory ammunition can be used in an improved rifl e if necessary. GunBlue examines the history of the incomparable .257 Roberts. Using the same 100-grain Ballistic Tip bullet, 50.0 grains of Hodgdon SUPERFORMANCE powder recorded 3,176 fps for a 276-fps advantage! 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. 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. View Profile View Forum Posts Private Message Title Premium Member Join Date Sep 2018 Location Cantonment,Fla. 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. 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. 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. Order now! 257 roberts for sale and auction. 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. Select powders gave excellent overall performance with heavier bullet weights. Gun is a Kimber Hunter in 257 Roberts. 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. Increase your rifle's performance up to 200 fps without extra chamber pressure, recoil, muzzle blast, temperature sensitivity, fouling, or loss of accuracy. These are a pair of old 257 Roberts 77's. 257 Roberts +P 117 gr SST® Superformance® Item #81353 | 20/Box US Patent: 8,161,885 | 8,413,587. 257 ROBERTS BRASS. There is a wide selection of .25-caliber bullets that have helped the Roberts become more versatile than ever. P.O. 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. "257 Roberts +P can not be used in guns that are chambered for .257 Roberts due to the higher pressure levels of the +P." 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. Thank you for your understanding and support. 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 Reloading Glossary. Gain a deep knowledge of ballistic science and access our improved ballistic calculator. 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. P. O. Ackley, master gunsmith, experimenter, and arms authority, sparked considerable interest in improved cartridges. .257 Roberts +P Brass.257 Weatherby Brass . For varmint shooters and coyote hunters, the Hornady 75-grain V-MAX is explosive and accurate. .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. Quantity: Quantity Limit of 0. 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. By the early 1960s, most manufacturers had discontinued chambering rifles for the Roberts, as demand for the .243 grew like wildfire. 3 Shots at 100 yards. The .257 is offered in a number of factory loads with 117-120 grain bullets. 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. 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. The 257 Improved is a fi ne performer, adding up to 100 fps velocity over its factory cousin. Consistent components translate to consistent shooting in the field. 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. Sell your 257 roberts for FREE today on GunsAmerica! Load Data &Technical Information by Caliber. 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.. Examples include Remington, Winchester, Savage, Kimber, Ruger and several others. “Bob,” as it is often affectionately called, was truly a dual-purpose cartridge that did both jobs very well. Cartridge: 257 Roberts. Open up the load data page you wish to download. The .257 Roberts certainly has a great deal of history behind it, yet is a story filled with contradictions whether discussing history or usage. 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. There is a wide selection of .25-caliber premium big-game hunting bullets that work well in the .257 Roberts. The maximum loads in the accompanying data are almost all +P pressures. Superformance® Propellants are the heart of Superformance® ammunition and usher in a new era of performance. 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. As a reminder, changing components will change the dynamics of a given load. With advancements in powder technology, including extruded and spherical, handloaders can achieve greater velocities than previously. Wolfe Publishing Company | 2180 Gulfstream Suite A | Prescott, AZ 86301, Swift A-Frame Revolver and Pistol Bullets. Comparison Edit. The Nosler 85-grain Ballistic Tip is another great choice that reached nearly 3,300 fps using Winchester 760 powder and was likewise accurate. Pet Loads and Handloader are registered trademarks of Wolfe Publishing Company. The 257 Roberts is one of two .25 caliber cartridges used for daily production testing in the Nosler Ballistics Lab. Powders include Accurate, Winchester, IMR, Alliant, Hodgdon, Vihtavuori SAWMAN. 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. it was designed by famous cartridge designed Ned R.oberts.. Disclaimer. Load Data Downloads. Superformance ammunition is safely within SAAMI pressure guidelines. Right … Hornady Superformance SST Ammunition 257 Roberts +P 117 Grain SST Box of 20 In naming the cartridge, Remington gave proper credit to its inventor by calling it the .257 Roberts. 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. 257 Roberts. A Swarovski 3-9x 36mm variable scope was used. 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. The maximum loads in the accompanying data are almost all +P pressures. However, it is still best to weigh every charge if trying to squeeze out the utmost accuracy. The 257 Roberts cartridge has a very interesting and curious history. 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. 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. Big-game hunters will have fun choosing their idea of the perfect bullet, or bullets that deliver the type of performance they desire. 257 Roberts. 5%, 10%? .257 Roberts +P (Speer Reloading Manual #14) reloading data with 116 loads. However, for handloaders wanting standard pressure data, starting and maximum loads should be reduced by 5 percent. Eligible for . Other than the stock being carefully bedded to minimize barrel vibration and the trigger pull reduced, it is original. When working with the .257 Roberts and my Model 70, I choose to go the handloading route. 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 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. The .257 Roberts (right) is based on a necked down 7x57 Mauser case (left). Incidentally, data developed with spherical powders should not be reduced below their starting charge weights, or erratic ignition and pressures can occur. 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. Cases were full-length sized, weight sorted and flash holes were uniformed. 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. 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. It was lated picked up by Winchester for there M54 and Model70 . Hornady offers a variety of .25-caliber varmint and big-game hunting bullets that are ideal for the .257 Roberts. I guess the whole issue is moot as you indicate a modern +P in my 1955 rifle would be fine. 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. However, Remington still offers a standard pressure load that pushes the 117-grain Core-Lokt at a more leisurely 2,650 fps. Regardless, it remains popular today and is an excellent choice for hunters. 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). 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. This was introduced by remington in 1934 for there Model 30 bolt action rifle. It was created by necking down the 7×57 Mauser case to the 257 bullet size. For handloaders who want to throw powder charges, spherical powders meter beautifully. However, the .257 also worked well with heavier bullets designed for hunting big game. It offered modest recoil, a flat trajectory, accuracy and reliable performance on deer-sized game. We call all major brands, calibers, and gauges of ammunition for your firearms. The bottom is a 257 77ST not really rare but kind of scarce. Offered in both 100- and 117-grain loads, velocity was increased by roughly 130 fps and 100 fps, respectively. Gas operated firearms are perfectly safe to use with Superformance ammunition. Remington, Winchester and others offer unprimed cases for the .257 Roberts. 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. When working with the .257 Roberts and my Model 70, I choose to go the handloading route. Properly -tailored handloads will group under .75 inch. around .465) is an excellent choice. Like all Hornady® ammunition, our Superformance® rounds use the highest quality cases and primers available. 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. 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. I know +P stands for "higher pressure" than a standard .257 Roberts round, but I wonder how much. Maximum overall cartridge length for the .257 Roberts is 2.780 inches. The Roberts was way ahead of its time and was something of a sensation. The .257 Roberts is popular, and most large ammunition companies offer +P loads. Posts 570. Sent from my Pixel using Tapatalk Similar Threads: Brass 257 Roberts and 30-06; 6.5 Roberts; 11-09-2018, 12:46 PM #2. Shop online for discount .257 Roberts ammunition from top ammo brands like Remington, Federal, Winchester, Hornady, CCI, Speer, and many more. Coyote hunters, the Barnes 80- and 100-grain Tipped Triple Shock X-Bullet and Hornady GMX... Pressures can occur experiencing extremely high shipping volumes and we can not reduced! 77St not really rare but kind of scarce, 50.0 grains of SUPERFORMANCE... Components will change the dynamics of a given load a deep knowledge of Ballistic science and our., Winchester and others offer unprimed cases for the Roberts was way of. 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