Hi all, my 2c worth. I think Teeny ment wall thickness, I also agree with the other posters. The fact is I use 2 1/2" in most of my guns that are chambered for 2 3/4" either modern or vintage and I don't see any difference when shooting wild birds, they fall just as dead with 2 1/2" as they do with 2 3/4".

It's better to be safe than sorry, so I would recommend in sticking to low pressure 2 1/2" shells.

Good Luck!!!!

Greg

Gregory J. Westberg
MSG, USA
Ret