The mania that people have for 2 3/4 instead of 2 1/2" is weird. It does not increase the proof pressure it just makes it easier to shoot longer shells in a gun which is not designed to handle the much higher factory pressures. I agree with others that removing more metal in the area of the highest pressure makes no logical sense. Proper 2 1/2" loads are easily found on the net or reloaded at your reloading bench. The thought of touching off a higher pressure, higher velocity, higher shot charge in one of those guns does not appeal to me or my fillings.
