I would like to investigate a little lighter payload. The MP mold drops a 525 gr slug. I'll have to cast some fosters today & weigh them. They should be around 450gr. Not too worried about recoil. If I can shoot 40 rounds of the 50 BMG in my avitar at a sitting I'll be OK. I think recoil from my Benelli Nova with 2 1/4 oz of sixes, 3 1/2 in. twelve kicks the most & I even have a recoil reducer in the buttstock. A lighter payload might give me a little more range although 100 yds would be a real long shot where I'll be hunting besides, you don't need 500 gr to kill a deer.
Bob