Just for clarification, I originally thought it was a fit issue but it has since been confirmed by CCI for my specific lot that it was a moisture issue in the bang bang material. The full response is above. I do expect to place a factory cap over a factory nipple, drop the hammer, and see smoke. If not, one of the two are incorrect. I’ve always been able to do this with my percussion gun and CCI caps so it’s validated that it can be expected at least for that combo. I incorrectly assumed cap fit on my original issue based on experience and what I was seeing. Case closed on this one.