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.

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.

lts on deer sized game. All in all, the 257 is an outstanding cartridge and deserves its recent r surgence in popularity. Superb accuracy is quite no 257 Roberts for T only.

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 Page, the …

Your guide to the number 257, an odd number which is prime. Mathematical info, prime factorization, fun facts and numerical data for STEM, education and fun.

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 Mauser as the parent case …

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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 killing power …

Jul 19, 2013 · Often overshadowed by the 6 mms, the .257 Roberts is a .25-caliber round that started as a wildcat, but is now being reintroduced in the Model 70.

Information about the number 257: Prime factorization, divisors, polygons, numeral systems, fibonacci