*Also, pay just as much attention to your caps. Many feel that an open breech from a missing cap is an even greater risk of a chainfire than an un-greased ball. Rather than bet solely on either horse, I avoid the risk on both counts.
-Dave
Yep, I know what your saying, about 40 years ago,
the very first time I fired a cap and ball revolver I had that happen. The caps were a very loose fit, not knowing any better (I surely do now), I simply loaded up the pistol, greased the front of the cylinder with Crisco, put the loose caps on, and touched it off. WOW! It fired off three chambers! The cause was positively due to the loose caps, as the front of the cylinder was and the balls were "Criskoed." Back then when you bought caps, it was one size fits all, as stores only carried one type, take it or leave it.
Not much info in those days and no internet, so for a time I just bent the caps a little in my fingers to make them tight. Nowadays I can get properly fitting caps and I also tune up my nipples/cones to have a proper tight fit.
Very good advice to all about having properly fitting caps. Since that incident so many years ago, I have never thought chain fires were the result of fire getting in from the front of the cylinder. Anything is possible, but I know for a positive fact, loose caps can cause a chain fire.
I have read Sam Colt was of the same opinion, chainfires were due to problems in the cone/nipple area.