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If your rifle has a 22" barrel subtract 120-150FPS, rarely will your rifle develope what the book says because the test firearm usually has a longer barrel. Even a 25/06 which will hold more powder than the standard 257 roberts won't make it to 3250FPS without pushing it to pressure levels that may produce short case life. I've never owned a Roberts but I think they would be a good caliber for light big game. My son has a 25/06 that he rarely shoots, he prefers his 280Rem or a 30/06 for hunting.. FWIW William
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