I have an older traditions sidelock that uses no 11 percussion caps. Our muzzleloader season comes in next saturday and I am wanting to use this rifle. I am using Hornady .495 round balls with a lubed patch on top of 100 grains of pyrodex select. The rifle has a 1'48" twist rate. It shoots fist sized groups at fifty yards but is giving me fits at 100. I felt like I was making progress but I had about ten rounds fired and I think the bore was fouled to the point that I called it a day. Am I expecting too much from this rifle to be capable of a 5 or 6" group at 100 yards with irons?