257 (two hundred [and] fifty-seven) is the natural number following 256 and preceding 258. 257 is a prime number of the form specifically with n = 3, and therefore a Fermat prime.

Mar 18, 2021 · The .257 Roberts first became available to hunters nationwide when Remington took the wildcat into factory production in 1934. It was developed by gun writer and …

Jun 5, 2025 · Rarely chambered today, there are still a lot of .257 Roberts rifles in use, adequate factory loads and 90 years of loading data. It’s still fast, flat-shooting, light-kicking, and versatile.

The .257 Roberts was the premier combination varmint/deer cartridge until the .243 Winchester and .244 Remington were introduced in 1955. These cartridges were highly touted by Warren …

Dec 13, 2023 · The .257 Roberts has lost none of the versatility that Jack O’Connor wrote about many years ago. In fact, with modern bullets and more versatile powders than were available …

The .257 Roberts was designed in the 1920s when wildcatter Ned Roberts started to do experiments on the .257 caliber cartridges. After some work he decided to go with a 7x57 …

Popularity of the .257 Roberts has remained static since its introduction. Only a few hunters use this cartridge and those who do, generally favor it for reasons of low recoil versus adequate …

The .257 Roberts is renowned for its versatility and mild recoil, making it a popular choice for hunting medium game such as deer and antelope. Its performance is comparable to the .243 …

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Feb 8, 2023 · During Blackjack’s operation, one of their side projects was a cartridge called the .257 Blackbird, which was a necked down version of the 7mm Blaser magnum cartridge.