So, since I started this thread, a lot has happened. I set up the cap maker I had in an arbor press and punched out some caps made from Foster’s aluminum, some .005 copper, and some .006 sample brass from TMF member Songwriter (THANK YOU!!). I also procured an eye dropper bottle and mixed up a batch of 5:1 acetone/Duco to fix my Prime-All into the caps. I also made myself a mortar and pestle for breaking up Prime-All (powder L2) out of a concave bottom shot glass and a flat-backed glass gem epoxied to a dowel with a turned down pointed end for packing the wet Prime-All.
I originally set up the punch on the ram of my press with the die on the bottom. But quickly learned that it would be better with the die on the ram, and the punch on the bottom, so the formed caps could be harvested on the bottom. Eventually I will make a special punch holder that has a cap exit hole in the front. For now, my die held with a magnet to the ram and my punch hand held on a block seems to work well. And so much easier than punching with a mallet.
I found the Foster’s beer cans to be a lot better than soda can aluminum. And I think the cap to nipple retention to be better still with the .005 copper I got on eBay. But the staying power from the donated .006 brass was definitely the strongest. I’d say any of the aforementioned materials are good for caps, although I personally feel the copper and brass to be better for retention on the nipple.
I definitely like the 4:1 acetone/Duco mix for fixing the priming compound. 1 drop per cap is recommended, but I’ve heard 1-2 is ok. I’m going to try 2 and will get back with results. In the 20 shots I fired over the weekend. I only had one FTF. So, I feel as a novice cap maker, that’s pretty good.