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    AI .338 LM mags (standard mags) and 250gr 300g?'s

    I am having a .338 LM built on a surgeon XL. Action is here and it will take the standard AI mags not the newer type coming out. Am I better to use the 250gr pills rather than the 300 gr sierra's etc as the heavier 300 gr will have to be seated to deeply (to feed through mag) and reduce powder...