RE: 2 3/4" vs. 3" ?
If you check the velocity charts, you' ll see that 2 3/4" shells hit harder than 3" shells. They have just as big a powder charge as a 3" shell, just less shot. My experience has been the same as Bennie. My gun patterns the shorter shells as well as the taller ones. If you get good patterns, stick with the shorter shell. However, its nice to have options.