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If you use a magnum primer the pressure from the primer igniting will move the powder charge and the bullet forwards so that, when the powder ignites, the bullet is already engaged in the rifling and you have artificially created a bigger case.

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So much of what we read in the gun world is speculation that "just sounds right." I'm not saying this is wrong, but without evidence to support it I can't accept it either. It just sounds right.

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