yes, different case internal volume and that would affect pressure and velocity and that may effect the bullets performance, hence hitting in a different spot.
how much? is anybody's guess IF it has any effect at all.
Whatever you are willing to put up with, is exactly what you will have.
When your ship comes in. ... make sure you are willing to unload it.
PAYPAL, sucks and I will never use them again. I recommend you do the same.
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