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Calibre winchester 1873. I would think that meant 44-40 but the problem with 44-40 is that the rims are just a hair to big and block the groove at the back of the cylinder. (cowboy loads) Any ideas?

More questions. To me calibre 1873 means 44-40 but even though they fit and the dia. is correct the rims block the groove at the rear of the cylender and prevent it from seating. The side of the barrel is marked Hopkins & Allen Manufacturing so it is before 1898 and has both a 7" and a 3"...