I took my TC Renegade 54 caliber out today using the same load I finally figured out after months of trial and error a few years ago. I tried 4 ball sizes, a dozen patches, multiple powders, tons of lube. All said and done, 1Fg was the top performer, although it is not as big an effect as ball/patch. The last time the rifle fired a shot was last December when I shot a ball through a fine whitetail buck. It has since been shuffled around, moved states, stuck into a new safe, and all I did was load it and shoot. At 100 yards, I hit perfectly centered, 4" low. I then continued to put 3 more into a group 2 1/4" CTC. I moved the target to 50 yards, took a single shot, perfectly centered, about 1 1/2" high. Well, I'm ready to hunt this weekend. I didn't dare shoot any more, stop when you are ahead. I know I'm still sighted in, and that's all I needed to know.
To be frank, I could shoot this rifle with FFg, and would be fine. 80gr FFg shoots an average of 4 1/2" at 100 yards. 90gr Fg shoots an average of 3 1/2". By average, I mean I can shoot five, 5-shot groups, and average the group sizes.
For those of you with a TC rifle that is struggling to get to shoot, the #1 most important thing I did was find the ball and patch it shot well. At one time I had three TC percussion rifles, a TC flintlock, and a TC scout pistol. The normal recommendation was a thin patch, and .535" ball. In every TC gun I had, that was the WORST possible combo. I mean really, really bad, might as well shoot a bare ball. I can get a smooth bore to shoot better. Instead I found a thick patch, and small ball was the best thing I ever did. The exact load I use is as follows
CCI #11 magnum caps
90gr Goex 1Fg
two 1/8" thick 5/8" diameter felt wads, ramed down to compress the powder
Carhartt jeans duck canvas patch, lubed with bear grease (mink oil worked just as well)
pure lead .520" ball cast from Lee mold, visually inspected and weight sorted within .5 grains of maximum
I ram down the ball so it sits on the wads, I do not bounce the rod or do anything else like that to further compress the powder. I do tap the lock area a few times with my palm after pouring powder, to insure powder is under the nipple. At the range, I also wet and dry swab both between every shot. It is not needed for hunting, and you could easily get 5 shots off without it, but it becomes very difficult to consistently seat the ball after that. Read that again. You could continue to seat a ball indefinitely, but you need to be able to seat a ball the exact same pressure on the powder, every single time. Swabbing makes that easy. Don't make things hard on yourself.
So anyway, don't knock Fg until you try it. The claims of it being dirty or loud, are bigger myths than the idea that plastic wads will fill your shotgun bore with plastic.