This actually gets a "complicated" maybe... I strongly suggest you do some research on the company sites for the various after market barrels... I have no first hand experience. But, I do know that "some" aftermarket barrel makers "claim" you can fire 3" shells in 3" barrels on what were orioginally 2 3/4" receivers. (And, I believe this is only with steel shot) But, I adamantly disavow any attempt to attribute advice to do so to me in any way, shape or form. I am merely suggesting that further research is required.