Just got some musket cap nipples for my Lyman Great Plains .54 cal that I built a while ago. Now that I am using musket caps instead of #11's, I get 100% ignition with T-7 which seems to really bring that rifle to life! I am using 230gr home moulded round balls, cotton T-shirt patches lubed with olive oil, and 90gr. of T-7. Cleans up easily and super cheap to shoot!