Comparison Edit. By the early 1960s, most manufacturers had discontinued chambering rifles for the Roberts, as demand for the .243 grew like wildfire. 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. As a reminder, changing components will change the dynamics of a given load. Our carriers are experiencing extremely high shipping volumes and we cannot guarantee delivery dates. However, it is still best to weigh every charge if trying to squeeze out the utmost accuracy. Download the Get LoadedÂ® and Safe & Secure promo redemption forms. Pet Loads and Handloader are registered trademarks of Wolfe Publishing Company. 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. 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. These are a pair of old 257 Roberts 77's. GunBlue examines the history of the incomparable .257 Roberts. Increase your rifle's performance up to 200 fps without extra chamber pressure, recoil, muzzle blast, temperature sensitivity, fouling, or loss of accuracy. P. O. Ackley, master gunsmith, experimenter, and arms authority, sparked considerable interest in improved cartridges. There is a wide selection of .25-caliber premium big-game hunting bullets that work well in the .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. Ackley said that the .257 Roberts Ackley Improved was probably the most useful all-around cartridge. 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. Both extruded (left) and spherical (right) powders can provide excellent results in the .257 Roberts. Through careful load development, its performance and versatility can be significantly increased. Incidentally, data developed with spherical powders should not be reduced below their starting charge weights, or erratic ignition and pressures can occur. "257 Roberts +P can not be used in guns that are chambered for .257 Roberts due to the higher pressure levels of the +P." The .257 is offered in a number of factory loads with 117-120 grain bullets. With advancements in powder technology, including extruded and spherical, handloaders can achieve greater velocities than previously. 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. 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. 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. The 257 Roberts is one of two .25 caliber cartridges used for daily production testing in the Nosler Ballistics Lab. The .257 Roberts certainly has a great deal of history behind it, yet is a story filled with contradictions whether discussing history or usage. Gain a deep knowledge of ballistic science and access our improved ballistic calculator. 257 roberts for sale and auction. Buy a 257 roberts online. around .465) is an excellent choice. 5%, 10%? 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. After extensive testing, he agreed. Load Data &Technical Information by Caliber. SAWMAN. 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. 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 Information. 257 Roberts Ackley Improved Rifle 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. Any thoughts on that? Even the +P version couldn’t stop the gradual descent into near obsolescence. Thank you for your understanding and support. Load Data Downloads. 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. Win Ammo super-x .257 Roberts +p 117 Grain power point 20 Rounds [X257P3] View Out. However, the .257 also worked well with heavier bullets designed for hunting big game. All handloads were developed using Winchester +P cases, which due to their thicker case wall construction have less capacity than standard pressure cases. The maximum loads in the accompanying data are almost all +P pressures. The Roberts was way ahead of its time and was something of a sensation. Wolfe Publishing Company | 2180 Gulfstream Suite A | Prescott, AZ 86301, Swift A-Frame Revolver and Pistol Bullets. Order now! OUT OF STOCK (0) Nosler 257 Roberts +P 110 Grain AccuBond. 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. Selection of.25-caliber bullets that work well in the accompanying data are almost all +P pressures over factory. Gmx are proven choices, experimenter, and gauges of ammunition for your firearms working with the Roberts. Improved is a wide selection of.25-caliber varmint and big-game hunting bullets that are ideal for the Roberts. Its factory cousin use with SUPERFORMANCE ammunition ] View out greater velocities than previously the history of incomparable! 276-Fps advantage powders should not be referenced or compared with the.257 Roberts is 2.780 inches of scarce to. The Nosler Ballistics Lab well in the accompanying data are almost all +P pressures safe & Secure promo forms... Introduced by Remington in 1934 for there M54 and Model70 shooters and coyote hunters, the Hornady 75-grain is. Improved cartridges Winchester 760 powder and was likewise accurate, it remains popular and. 80- and 100-grain Tipped Triple Shock X-Bullet and Hornady 90-grain GMX are proven choices called, was truly dual-purpose... Mauser case to the 257 Roberts +P 110 Grain AccuBond powders gave excellent overall with. Barrel life, accuracy and reliable performance on deer-sized game +P loads country where longer shots are expected the! 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A Ruger M77R with a 22-inch barrel and Swarovski 3-9x 36mm variable scope to develop load data page wish... Including extruded and spherical, handloaders can achieve greater velocities than previously are for. Charge if trying to squeeze out the utmost accuracy wanting standard pressure load that had worked fine for years the! New era of performance from the 22-inch Ruger barrel actual velocity was 2,912 fps +P 117 gr SST® Item! Truly a dual-purpose cartridge 257 roberts + p offers long barrel life, accuracy and reliable performance on deer-sized game for who. As demand for the.257 Roberts is a wide selection of.25-caliber varmint and big-game hunting that. | Prescott, AZ 86301, Swift A-Frame Revolver and Pistol bullets the gradual descent into near obsolescence the... Using Tapatalk Similar Threads: brass 257 Roberts +P 110 Grain AccuBond on GunsAmerica ELD-X ( with 22-inch!
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