Chuck,
If my statement sounded like I was disagreeing with you, I was not. It is hard to believe that pressure, psi, which is force has nothing to do with recoil. In my opinion the force is going two ways forwards and backwards, and the backwards would be felt recoil. I know what people say but I have a problem trying to deal with the equation.
Still again my opinion, I reload 2 1/2" 20 ga. and 2 1/2" 16 ga. for short chambered "elsies" and I would not put 2 3/4" shells in it even though thousands have been fired that way.

David