Only problem for me is that the 12ga 2 3/4 inch is the "African" standard shot shell size. Finding a 3 1/2 inch in the old Brno side lock is not possible. The hulls I use are super strong(much thicker than Magtech, they are more than long enough for the task and there is more than enough space to up the charge if needed. I think the 12ga 3 1/2 inch will only give an advantage when using shot for bird hunting as you can fit more shot in the shell. I have not found the 12ga 2 3/4 wanting for the purpose.