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An old friend of mine had a .500 3" BPE, in gold script on the top rib, MADE FOR MAHARAJA some name I can't remember.
Will worked up loads with a phony powder, but a duplicate powder load would be 110gr. 2F Black Powder and he used the 450gr. Lyman bullet, #515141, grease groove bullet.
IIRC, the barrels shot fairly close but diverged 3" or so at 100 yards, but individual groups. The right barrel groups were usually 2" at that range, right on the sights.
The left group would easily be compensated for, by holding slightly right.

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