The good news is that, unlike many other levergun cartridges, the 444 has a bona fide throat that steps down to groove diameter instead of an oversize funnel. However, the leade is only about 0.050" long, and a full diameter tangential ogive will not chamber. Never mind that such and such an LBT bullet will chamber, because there is no standardization for the LBT designs, and many commercially cast "LBT" bullets are not true LBT designs, anyway.
The leade angle appears to be 5° per side (or 10° total), a little steeper than ideal, but at least it has a leade.
Glen Fryxell's solution is an undersize ogive. The 0.425" diameter nose lightly engraves in a microgroove barrel.
I don't know if these designs are optimal for Winchesters and TC's.
Instead of using the longest possible nose, Glen went with a 0.315" long nose because it feeds better.
I like the big body bands because they are easier to cut and easier to cast than itty bitty bands.
For load details, see http://www.leverguns.com/articles/fryxell/444marlin.htm
** Nice looking bullet. What is the overall length?
** About 0.825", including the gas check.
** Thanks... interesting bullet mold. Love the 444!
** BTW, the bullet in the picture weighed 301.8 gr. cast from straight wheelweight.