Daryl, I am not new to casting as I have been casting round balls for quite a few years and dabbled a little with an original RB in 50-70 and a Pedersoli RB in 45-70. Never did get them to shoot to my satisfaction though so always went back to the old round ball!! And yes I DO SHOOT REAL BLACK POWDER!!!!! (is there anything else???) I was able to mic the bore of the Kodiak as it has 6 groove rifling...bore is a tight .444 and grooves at .460. I posted below about a '73 trapdoor and it is very hard to get a good measurement on the 3 groove rifling but the slug came out (about?) .450 bore and .460 groove. looks like a .459 mold is what I need, I just don't know about that HB. I always put a card wad under my bullets and can't see how a wad would work with a HB, on the other hand I can't see how black powder would work without a wad??? Maybe melt the skirt? But I am told the original BP round used this HB design,,,I'll check Buffalo Arms.... Sheesh... I think I am going out and shoot some round balls,,,They're less trouble!!!! Ha....Ed