I just got a Stoeger STF 3000 (double barrel over/under) from Dick's for Christmas. It is chambered for 3" shells. My question is can I shoot 2 3/4" shells with it? The owners manual is lacking in info on it. I would think I should be fine. If not, I'll have to give the Wally World box of 100 to my buddy across the street. Wally World did not have any target ammo in 3" either.