OK, it's really a .45 Colt but for these boolits it's a ".44 bore".
These are a perfect fit for the bore, made with #445369 and a plain base plug. They drop out at 362 grains. Will probably start with 65 grains of FFg once checked to assure the powder column keeps the card in the rifling. Rummaged around and found some brass with standard primers.