Truthfully, 44-40 loaded with Mav Dutchman Big LubeŽLLC bullets can be shot without having to compress the FFg black powder hardly at all. Just don't leave air space because of dirty burning due to low pressure. Just fill your case to the base of the bullet, seat and crimp. Good quality black powder is actually clean enough to function trouble free without having to firmly compress it.
I've found that the organic fillers can cause cylinder base pin fouling more than the soot residue from black powder alone. Coat your cylinder base pin liberally with white lithium grease and your guns should be good for an entire match. Check the gap between the cylinder face and the back end of the barrel. It should be between Five and Eight thousandths of an inch. More than that and the soot seems to not blow away and the cylinder binds up. Less than that and the cylinder binds up. So, on my guns, that's the magic gap measurement for trouble free function.
Your a good lookiin pair. Congrats, fine lookin grandson. Mine love to come to Gampa's to look at my guns and shoot. One told his mother once if ISIS ever attacks, he's goin to Gampa's because he has guns.