I once had an Italian 3" 20ga that weighed 6¼lbs with 28" bbls. For the hunting I was doing with it it got mostly the 2½de-1oz load, but I shot some 3" loads of 1¼oz #4's through it. It was quite trim & handled well & recoil was not excessive for hunting purposes. I guess the game I shot at had been reading Mr Sell's writing for they all seemed to fall dead at the shot, including some ducks & a goose. My take is if the majority of your shootin will be with an oz of shot & only occasionally an 1¼oz the 3" 20 is fine. For a gun to be used predominately with 1¼oz I would go with a twelve & preferably one of at least 7lbs for the 3¼de-1¼oz loads & heavier if using the high velocity 3 3/4de 1¼oz.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra