I have loaded and shot my own 2" shells in guns with 2 3/4" chambers a number of times with no ill effect. Maybe something else caused the " shot balling," whatever that is. Many of the guys at the club shooting those games like " Three Gun Action " or whatever it is they do use 2" shells so more can be loaded at one time. Mossberg pump guns use some type of attachment to make them work so it's done quite often without problems.