All true, and duly noted, but none of these things IMO explains the phenomenon of why the 12 ga. 3" Magnum was so widely and quickly accepted when the smaller gauges were not. I may not have made myself clear. I'm not looking for why the 12 was accepted in a simple 3", but why it was so widely accepted in a 3" magnum. Obviously, all the 3" introductions of later times are, and have been, magnums. Or, put another way, heavier than normal shot loads.
Thanks for all the replies, but still looking for an answer.
SRH
