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I like your thinking. There were at least 2 10 bore case sizes (diameter not length) in the Holland 10's. A .775 diameter "paper case" gun and an .805 diameter "thin wall" brass gun. A 2 7/8" .805 case accommodates 8 drams of black and an elongated bullet (.968 in length) nicely. A 2 5/8" .775 case accommodates the same bullet and only 6 drams of black powder. A 3 1/4" .775 case would probably be an 8 dram gun or more but shoot the gun and let it tell you.

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I fired here this last weekend a full 10 dram(270grain) load...pushing a 900 grain bullet. Recoil was really up there...but it was fun and my adrenelin was pumping..I was thrilled
I would not be afrain to fire an 8 bore..actually..looking forward to it one day
I am glad the gun weighes 14Ibs though.
An 3.25" 10 bore can take 10 drams as a maxload with 900grain...maybe 11 drams if roundball being used.