I have the problem solved at last. I found a #11 nipple made by MSM and the caps fit perfectly. They fit snug yet I can pull them off. They fit great.
I don't understand why there can't be a standard across the industry in all muzzleloading parts and accessories. It sure would make life easier.
Muley Hunter, I was going to go with musket caps then I find out how hard it is to find good caps. Seems the good ones are not being made and the CCIs have lowered the charge because of the reenactment thing. I thought this would be the easier route. We will seem I guess.