I'm not much of a shotgunner anymore.
But the shotgun I have by far killed the most game with was a simple Stevens 311 double barrel. Modified and full barrels. Double triggers.
One of the guns Skeeter had in his "Me and Joe" series was a Stevens double. The other was a Remington model 12 (22 RF).
One of the guns of my youth, my Grandpa's model 12 out of east Texas.