Hey!! I must agree with the Pryor guys. Now you have your rifle back. "It's a Good Thing" (stolen line from famous personality). It's a 45 and suffers Blow-By. That's rather normal. A nuisance, but normal.
I go back to my Patented Snake Oil suggestion. Skip the Schofield cases and run 44-40 cases. You already have a 44-40 rifle so you should have a few 44-40 cases laying around. Give it a try. OR:
Follow OD#3's lead. Anneal 20 or so Schofield cases, load em up and see how it works. After all, I'm finally throwing in the towel, biting the bullet, taking the medicine then hiding in the dark. Yep ..... I'm gonna anneal some 44 Russian cases and see if I can cure some 44 Blow-By.
As another suggestion. My 44 Henry Flat duplication load is done with Cowboy 45 Special cases. Full case of 2F or 3F APP (give that 777 stuff the heave ho) with a 160Gr RNFP or 200GR RNFP bullet. Contact "The Smith Shop" in RI for their custom Henry Carrier Block with cartridge stop. Or save a few bucks (lots of Bucks) and drill your carrier block for a set screw cartridge stop and relieve the side of the bold for stop clearance and run the curious little cartridges. Oh, did I mention, you can load 17 of them in a Henry. Loads on Sunday and Shoots All Week!!
Coffinmaker
PS: I Still suffer Blow-By with C45S cartridges. A little squirt of water or PAM on the Carrier Block after 3 or 4 stages takes care of it.