I watched Chuck Connors a lot, but I've never seen a .44/480 in person. My 3rd ed. (1953) of Phil Sharpe's
Complete Guide to Handloading, more or less the bible for old and obsolete cartridges, shows a .44 WCF (.44/40) round for the Model 1873 rifle. All loads with pretty fast burning powders, typical is about 9 gr of Unique with a 200 gr bullet.
If you can ever get hold of a copy of this book, it's a charmer. Very useful loads for obsolete calibers, scathing reviews of cartridges he didn't like (his riff on the Italian Carcano is worth the price of admission all by itself!) Mr. Sharpe was opinionated, to say the very least, but he surely knew his business (and he was personal friends with Col. Whelen and almost all the other wildcatters and gun bugs of his day.)
EEEeegads....work fatigue brain malfunction...It was a .44/40. I believe it's ballistics are similar to a .45acp. It'll make a very big hole from 75 yards in, but drops like a rock after that.
You sound awful sophisticated for a native gal....; ^ )>