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I bought a 50 cal lyman flintlock this summer. everything is fine but i seem to drop quite fast at 70-75 yards. Using a hornady pa conical and 70gr fff charge. my groups are very good, but group drops off fast at 70-75yards. I still have a 1 1/2-2" group at that range just a foot below target. I figure more powder will probably help but don't know what more i could put in safely. thank u