Yeah I bet that would kick like a mule! I guess I am coming from shooting modern rifles. A 50 cal ball with 100 grains of black powder is a mild load to me. That is only a 180 grain ball. When I build my flintlock I want to go at least 58 cal, so your 75 has piqued my interest!The ball weighs 753 grs, I won't call it a tack driver but it's plenty good enough for hunting 2-3 inch at 50 yds. It shoots best at between 100-125 grs of 2F. I've taken up to 200 grs but it ain't fun to shoot with that much powder. With those heavy loads, I use a fiber over powder wad and then a patched ball otherwise the patch gets burned up badly.