I bought one last year and made a test batch of caps. The die took a bit of trial and error, but once I figured it out it was easy to bang out caps. The priming compound was simple to mix and I used a drop or two of acetone mixed with Duco cement to keep it in place. A little tedious, but no big deal to fill the caps with priming compound. The compound stayed in the caps and they all went bang and satisfactorily ignited my sidelocks. If anything, they were a bit hotter than the Rem 11s I was using. So I would say it is a usable product and makes decent caps. No idea if they would play nice with a revolver, but I'd guess the biggest issue would be cap size vs. nipple fit.