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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, [2] is a...
- 257 Weatherby Magnum
The .257 Weatherby Magnum is a .257 caliber (6.53 mm) belted...
- .257 Roberts
Sep 20, 2023 · History Of .257 Roberts. 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.
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BACK. In our latest Campfire blog, Craig Boddington, the globally-respected outdoor journalist shares his impressions of the .275 Rigby cartridge and Highland Stalker. Craig has over 40 years’ experience exploring the world as a hunter, writing dozens of books, articles and essays. A decorated Marine and award-winning author, he’s seen as a ...
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 ...
The .257 Roberts certainly has a great deal of history behind it, yet is a story filled with contradictions whether discussing history or usage. 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.
