The question that remains unanswered for me is . . . pressure. Soft shot may protect the barrel, but if we're talking SAAMI pressures, then it's not for a whole lot of vintage doubles. But since I seldom shoot nontox, it's not an issue for me--and I probably have enough of the Kent stuff, in 2 1/2" 12ga, to last me as long as I'll be shooting birds.