If it is cyl bore, it will work with a good patch and lube, but too much powder will result in less accuracy. Smoothies generally like mild charges, 50-75gr 1f or 2f by volume max should work best. Rounds balls are available in .705", .710" and .730", but if you have choked barrels, the more choke, the less likely it will shoot well. But you need to work out a consistent sight system or you won't know what's accurate!

I just weighed the 72cal R/B and loaded like a magmun Shot round complete with a "short" shotcup. Works fairly well and was meant for very close range Bear medicine. derf