I have three .50 caliber black powder, muzzle-loading traditional rifles, 2 older CVA cap-locks (percussion cap) plus a Tradition's "Shenandoah" flint-lock Long Rifle. Of the 2 CVA cap-locks (Both Hawken rifles), one is my target rifle (28-inch barrel, 7½ lbs) and the other is my deer hunting rifle... a Hunter-Carbine CVA Hawken with a 24-inch barrel that weighs just 6½ lbs and is very handy in the woods and easy to carry.
All three rifles shoot very accurate 3-shot groups using 47 grains of Goex or Swiss FFFg with a .490-inch Hornady swagged round ball patched by .016" of cotton denim lubed with a mixture of bee's wax and liquid Crisco with a thin vegetable over-powder wad.
The little Carbine's hunting load is 70 grains of FFFg Swiss and the .490 rifle balls is capable of shooting through a deer at 80 yards or less which is my self-imposed range limit. The point is, you don't need a heavy charge of black powder in a .50 caliber rifle to put a deer down. Therefore, I recommend that you test your loads and choose "THE" most accurate load which is adequate for the type of terrain and the distance you shoot.
For paper targets, the 47 grain load works just fine out to 50 yards yielding 3 inter-locking holes in the paper off the bench-rest. For hunting deer, the same can be said for the 70 grain load of Swiss FFFg in the Hawken Hunter-Carbine. Your rifle may not "like" these loads, but give 'em a try and find out if they are as accurate in your rifle as they are in mine. :yeah:
Strength & Honor...
Ron T.