I spent the afternoon yesterday shooting Sporting Clays with my W.W. Greener 1882 vintage Hammergun. It has those dangerous 2 1/2 inch chambers and it didn't mind those 2 3/4 low pressure loads at all. As tests have shown they only raise pressures about 100 psi. I reload with Pb or 7625 and they never go over 6500psi.