I have two GH parker Damascus guns, 1890s vintage, both have 2-5/8-inch chambers. They shoot 2-3/4 shells fine. My favorite new shell is the AA low recoil, low noise, 28 gram shot load at 980 fps when I can find them. Otherwise, I load federal papers, 3/4 or 1 oz. with Clays, International, or Green Dot powders. See loading data for several suggestions on # of grains which has loads under 7,000psi. But, as stated previously, have the barrels checked out by a Gsmith, checking the wall thickness and lockup of the action.
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