RE: 2 3/4" in 3" magnum?
It all depend on the loads for my gun. My semi-auto will not eject light loads but I don’t have any problems with magnum loads in 2-3/4” shells. It also makes no difference in my gun when using low or high brass shells. They both work the same. I would suggest to try some shells that will be used for hunting. Then you would know for sure.