I never saw anything but 12s on Nova Scotia's Eastern Shore where I grew up. Then villagers who had gone away to the Boston States to live would come home to hunt sea ducks after the war with Model 12s. As Lowell said, they were the guns to have. It has remained so. As far as I know, I'm the only one for many miles around using the 16 and 20 in a duck blind. And definitely the only doubles in those gauges.