Barnes Bullets Reloading Data for .257 Weatherby Magnum Ammunition is now available for Hunter and Reloaders who are looking to use all copper bullets!
The .257 Roberts is the end product of a long line of experiments by Ned Roberts in an effort to find the ideal .25-caliber varmint cartridge. When Remington adopted the cartridge in 1934, albeit with a few minor changes to facilitate production, it was renamed the .257 Remington-Roberts, to avoid confusion with any one of a number of rifles that were chambered for the true Ned Roberts version. Historically, the .257 Roberts, as it is now called, was saddled by relatively low pressure limits, owing the hundreds of Model 93 and 95 Mausers that were rechambered for the .25-caliber wildcat. Presently, the rule of thumb is to hold older Mauser rifles to a maximum operating pressure of 45,000 psi while modern sporting arms from Winchester, Ruger and Remington can bump the limit up to 50,000 CUP. For comparison, Winchester +P .257 Roberts factory loads with a 100-grain Silvertip generate approximately 3,000 fps from a 22-inch barrel, easily comparing the .257 to its chief nemesis, the .243 Winchester.
- Barnes Bullets Reloading Data for .257 Weatherby Magnum Ammunition PDF Document
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