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Gentlemen,
Is it ok to shoot 2 1/2 RSTs in a 2 3/4 chambered gun? I know the opposite is a problem. Not actually sure what the chamber length is in my 1903 16 ga 0 frame so just trying to be on the safe side - I think. The gentleman I bought it from at a gun show said it was 2 3/4 but unless the chambers have been lengthened it would seem they are likely 2 1/2 since everything I read indicates that is the case with most old pre WWII doubles.
Shell vs chamber length
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