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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. Thus a regular polygon with 257 sides is constructible with compass and unmarked straightedge. It is currently the second largest known Fermat prime.
- .257 Roberts
The .257 Roberts, also known as .257 Bob, is a...
- 257 Weatherby Magnum
The .257 Weatherby Magnum is a .257 caliber (6.53 mm) belted...
- .257 Roberts
The .257 Roberts. The fine .257 Roberts is based on a necked-down 7mm Mauser case, and was legitimized by Remington in 1934. 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.
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Mar 6, 2017 · The .257 is the original dual purpose caliber. You see, that is the allure of .25 caliber rifle cartridges. Unlike the 6.5 caliber cartridges, .25s can handle lightweight 70-gain bullets for...
Sep 20, 2023 · The .257 Roberts started life as a wildcat, devised by gunwriter and tinkerer Ned Roberts in the 1920s who tried his hand at necking down a case to shoot a smaller bullet. The idea, as always, was to decrease recoil and gain ballistic advantage through sheer velocity. The parent case is 7x57mm Mauser.
Sep 4, 2019 · In 1935, the legitimised .257 Remington Roberts was offered in Remington’s Model 30 bolt-action,a 1921 sporting version of the M 17 Enfield military rifle. Winchester followed by chambering its Model 54 bolt action for it.
