There is no such cartridge as the "venerable" .257 Bob.
Its the .257 ROBERTS
originated as a wildcat by Ned H. Roberts and adopted by Remington as a commercial round in 1934.
Roberts was his last name not his first name and therefore it is incorrect and inappropriate to shorten or change it to "bob".
Does your rifle have the thumb slot for clip loading? If it does, it began life as a military action. If not, it was made from a commercial action.
beyond that we need info on the markings, clear pictures (sized for TFL) preferred.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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