I shot one round of skeet with 16ga F2 B&P in my sub 6lb gun. I was done for the day! Recoil was just nasty. I had bought them as the dealer was out of RSTs at the moment and he assured me they were low pressure loads. I returned the rest of the flat in exchange for RSTs when they came in. It isn't the pressure that causes the recoil - it is the 1300 fps velocity!