With machined brass shells the .750 card and wad would work fine. 10 gauge extruded brass would take a 9 gauge wad (.815). My 10 gauge lifter has .802 bores. Are you using Ballard brass shells? I had been shooting those in 10 gauge and noticed the brass had bulged. I measured the outside diameter at the base and found that the shells were really 12 gauge despite the 10 gauge marking.
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