You can make your own using a kit from .22LR Reloader, either no 10 or no 11 caps, they have a die for each. Their primer compound is a four-part powder that you mix in small quantities. Use the supplied dipper to fill the primer cup and spritz with some cheap hair spray to keep it in place. It is a corrosive mix, so cleaning is required asap. But we are talking about black powder firearms, so cleaning is mandatory anyway. One thought, you can substitute the beer can aluminum strips for .004 brass strips from Amazon, much more durable primer. Not required in revolvers or long guns, but if you are shooting a Uberti Remington New Model Army carbine, these may be much better than commercial caps as your face is closer to the nipple during ignition. Also, you can go to the social media MEWE and look up the group Primer Reloading. There are a lot of folks that are reloading their own primers, percussion, and center fire, using noncorrosive priming mixes with excellent results. I think it is Aardvark reloading on Rumble. Gives the procedures and chemicals required to reuse center fire primers. Plus, there are some innovative tools available from different members.