. Aha!! Pinched caps!! That is more than likely what led to your chain fire rather than the T7. I have shot a lot of T7 over the past number of years with absolutely no problems. I don't like the cost so I don't shoot it so much now. I have found that checking the nipple size at the middle of the cone should be around .165 to .174 for a decent fit on #11 CCI caps. This gives a snug fit without having to force the caps on.
I would not argue with that. However, since I used pinched caps up until the 777 with not a chain fire, and for a while after with black powder, and no chain fires....??? But I agree, the pinched caps most likely had something to do with it. But it does burn at a higher temp I believe. Perhaps it was all just the "perfect storm". I've never heard of a rash of chain-fires happening with T7 in general. Have heard of some damage to guns with it. Dropping rammers, sheared off rammer latch-studs, and damage to side-lock rifle locks with it. (and everything I've heard on the internet HAS to be true!)
I am now completely sold on getting the perfect cap-fit. Even if a loose cap does not cause one, or "facilitate" a chain fire, it sure is
annoying when they fall off the nips from recoil. !!!! What I plan to do with all my revolvers (all three of them) in the future is to start off with overly large nips, and then turn them in the drill press until I get that perfect fit. I like a
little force to fully seat them because I think that makes them more water-proof. In all the videos I've watched about water-testing BP revolvers, it seems like it's always the caps that get wet. Change the cap, and the gun goes off. ? That's my theory and I'm sticking to it. !
Anyhow, the cones on my 1860 were too big for the CCI's, fit the Remingtons perfectly, but I'm about out of them. Sizing them down to fit the CCI's (of which I have 1000) was really fast and easy to do. My Remington New Model Army and 1860 both fit the CCI's well. But I'll double check that soon. I may have shot them last with Remington caps, and forgot, but I don't think so.