https://www.youtube.com/watch?v=Iazh2CGiY_s&t=951s

I don't have a print link to the study you refer too, but here is a video link of Mark from the Cinnabar covering it in detail.

I've recently been trying Horse Soldier Bourbon, good stuff.
https://horsesoldierbourbon.com/pages/our-bourbon

That's going to be a beauty when you get it finished. My sister has (her late husbands) a BATJACK trapdoor carbine. It is very rough inside and out, the bore is extremely pitted so I suspect it fired a lot of BP blanks over the years.

Tom

I recently had a 45-70 case break off in the chamber of my 1886. I soaked it with Kroil then tried a new brush and a tight patch neither worked. I didn't have any cerosafe so I pushed/pounded a lead roundball through as if slugging the bore and it took it right out.

Tom