Back before the present day, I purchased a DIY percussion cap maker (Tap-o-cap) from Forester. Fortunately, for many, another company (22sharpshooter) makes a similar tool. In this video I'm only testing some roll caps that I was able to order and wanted to check them out before ordering more, as I haven't been able to get any locally. Planning on testing them on various powders this summer.
Special thanks to TheOutlawKid for his information on "How to make Hot percussion caps".