Jerry. Is your gun chambered for the brass shells ( abrupt shoulder ) or the paper hull. One of our members tried using 2 7/8" hulls in a gun chambered for 2 5/8" for the brass hulls and it kicked real bad. Just my opinion but an 1 1/2oz of shot through a 2 5/8" chamber may be a little much. Paul Harm may be able to tell you more about it. He gave me the loads for mine.
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