I have found that when i shootany 2 3/4in loads out of my 3 1/2in chamberd gun i get horrible patterns. I was told it is because it gives the shot too much time to expand to the size of the chamber then the sudden compression to the bore size deformes alot of the shot. I get good patterns with 3in and 3 1/2in shells though. I use it mostly for deer and turkey so shooting 2 3/4inshells isnt a top priority.