Junior's article on loading BP cartridges for the 45/70 would probably provide good insight on loading for the 444 Marlin. When (if) I can remember what thread the link to this fine article is in I will post it. I think it is in the H&R Muzzleloader section but not for sure.
Why be difficult, when with a little extra effort you can be impossible?
Wife's Handis; 300 BLKOUT
MINE: 270W, 308x444, 44 Bodeen Belted Magnum PI (Profino Improved), 444M shorty, 444M, 445 SuperMag Shikari, 45 ACP shorty, 45 Cal Smokeless MZ, 50cal 26" SS Sidekick, 50 cal 24" Huntsman, 50 cal 26" Huntsman, 50 cal 26" Sidekick, 50-70 Govt Shikari, Tracker II 20 ga shorty, 20 ga VR Pardner, 12ga VR NWTF, 12ga Tracker II shorty WITHOUT scope, 10 ga Pardner Smoothbore slug gun, 10ga Pardner Turkey & 24ga Profino Custom rifled slug gun.
Active Trader until: July 25, 2013