Froogal
First a CAVEAT: I fervently wish the creation who first put fourth the term "Period Correct" had been struck tongue tied prior to the utterance.
Second CAVEAT: Ain't no real substitute in a 44-40 for a 44-40 cartridge. A 44-40 is what it is.
So stop worrying and learn to love the Bomb (stolen famous movie title). With a little annealing, 45 Colt (atz all I shoot) will run just as clean as any "dash" caliber. I know that isn't your primary concern, but when stuck with cake mix - make cake.
Avoid People - They Be Hazardous to Yer Health