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Harry, your 10 has .804 bores now. It probably left Meriden with bores closer to .790. Most of my early 10s have been around that figure as most early 12s are around .750. My last project, a 36" GH 10 from 1912 had pitted bores of .779 and chokes of .042 when I bought it. It now has clean bores of .790 with the chokes remaining at .042". With 1 3/8 oz of Bismuth #4s in an SP-10 shot cup it patterns "full and full"...
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