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KCrow,

Has Boss identified what cartridge it is chambered for? You definitely will want to start out with chamber casts before doing anything.
Curl

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Boss has very limited records for this rifle, their only listing says it's a .410 made in 1874. I did a chamber cast and it definitely looks like .410 brass trimmed to 2.22 will be the closest fit. .444 Marlin would also work. Thanks for your help!

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