I haven't hunted blackpowder for about 20 yrs and am getting back into it. I've always hunted with FFg blackpowder, but understand that many shoot with the blackpowder substitutes. I have a .54 renegade and was wondering if it's safe to use the subs in this older percusssion rifle. If it is safe, how much should I use safely. I usually shoot 100-110 grains of BP. Any info would be great!