I have tried RST's 2 1/2" 1oz. #7 spreader shells in my right barrel. RST loads great shells, however, the #7s just didn't do the job well for me. To many running cripples on pheasants. I went with Polywad English 2 1/2" 1oz. #6 spreaders in the right barrel and the problem was solved. My gun is a 1930 vintage C.G. Bonehill SLE 12 ga. with factory 2 3/4" chambers and is choked Mod. right tube and Full in the left barrel. I always have an RST 2 3/4" 1 1/8 oz. #5 in the left tube, just in case. Last season I went to the rear trigger more than once and boy, the #5s knock a pheasant down with authority.