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In this corner NW corner of Ohio, by the Western End of Lake Erie, THE farm gun was often a hardware store or mail order single bbl , mostly in Twelve.
I think John nailed it. All the "this was my grandpa's gun" I've seen around here have been single shot 12's.

For some reason my family all had single shot .410's. Either they really liked squirrel hunting, or they couldn't shoot a .22 well enough. :p

But for doubles, around here there seems to be a lot of 311's used hard. Mostly in 12, a few 16's.