I agree RR. But even brass chemical composition varies from lot to lot. What I am saying is that if you load below maximum charge listed in a loading manual (which even varies from manual to manual) the only "problem" you will encounter is a loss of accuracy. But for hunting except at extreme ranges is not that big a deal. There WILL be pressure differences with the same charge between brass manfs. but the pressures for all cases will be under the recommended allowed for the chambering.