Why do you prefer real black powder to the substitutes? If read real black is better in traditional guns because it will ignite easier but hadn’t seen any mention of using it in inlines.
Inlines, the "next" evolutionary step in a "traditional" muzzleloader had cartridge guns proved to be a dead end. In the quest for velocity and ease of use, they're the next step. Guys with them are usually looking for modern rifle velocity and many completely lose sight of the fact that a traditional gun is just a capable if they practice and use good fundamentals.
Real black v subs- Pyrodex was the first sub out there and was touted as being as good as real bp. I seriously beg to differ as the fouling is much harder and more abrasive and corrosive if not cleaned immediately after shooting. Every ruined modern gun I've seen was shot almost exclusively with Pdex. There are those who differ, but sorry, I even have personal experience with this problem. We put away a replica 1858 Remington after being shot with Pdex and detail cleaned and oiled. In the safe over the next year, the bore was pitted and there are minor rust pits all over the areas where the Pdex fouling was before cleaning. This level of pitting wouldn't have happened had we cleaned it again in a couple days as the acid from the fouling found it's way into the microscopic pores of the metal. But the claims for Pdex were "easier to clean"... NOT. Real bp also has a different pressure curve in ignition and that can have an effect on accuracy. Real bp is easier to ignite meaning it's the only reliable powder for a flintlock. Yeah, I shoot those too. Real bp is VERY easy to clean up. Windex is the best cleaning solution I've seen as it has water, alcohol, and ammonia. Water will cut the fouling, ammonia is a base so it neutralizes the acidic fouling and alcohol aides in drying. With Windex, I can clean my competition muskets in about 10 minutes flat and that includes oiling and there will be no rust when I break it back out at the range. Barring Windex, plain old soap and water will clean up real bp, just takes a bit longer.
Finally, I shoot black powder competition and our rules stipulate real black only. In North South Skirmish Association, we shoot Civil War guns in competition and many are original arms. The corrosiveness and different pressure curves of a sub would be detrimental to an original.
But what the heck do I know about this stuff.................
Flintlock. 54cal Kibler Colonial. 530 ball, Swiss REAL black powder
1863 Sharps carbine. Paper cartridge. REAL black. Old Eysnford
1862 Colt Contract. 44gr REAL black, Old Eynsford