Shooting ounce and a half "baby magnum" duck loads out of my father's 12 ga. Ithaca Featherlight M37 pump. As a 12 year old. ( back in the lead shot days) That was painful and actually a little scary. I sure as heck didn't kill ducks any deader with those shells than standard duck loads with 1-1/4 oz of shot, which also kicked bad but were "manageable". Loved that old Ithaca but it was not a good fit for me or the purpose I used it for.