Because of the way .44 barrels are measured on the 1860 you will need .45 bullets. I don't think anybody makes a converter in .44. You might be able to send it off to Kenny Howell and have a custom converter made, but that would be very expensive. As it is, the converters cost as much as the gun.
Kirst and R&D make 5-shot .45LC converters for the 1860.
TK
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