Chainfires - the skinny? Maybe....

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Very informative video, @TFoley. Thanks for posting it.

I think that information on how to properly fit a percussion cap to the cone of the nipple would have been helpful. I agree with his premise that most chainfires are caused by fire getting around an undersized ball. Once I went to properly sized balls, I eliminated chainfires. I have measured the cones to know which cap size I should be using in that revolver. Remmington #10's with their longer skirt seem to fit better that CCI caps with shorter skirts. CCI #11 caps will fit loosely on the cones sized for a #10 CCI cap.
 
I continue to think and agree that most chainfires happen at the chamber mouth. It is 100% certain and for sure, as this video, and others like it have shown, that you can do it with an under-sized bullet. This is also where the biggest outgassing happens while firing.

Now I will not say it can't happen from the rear/nipples. Obviously, if the chamber is open at either end, then either end is a possible transmission path for flame.

But we know for certain sure that an under-size bullet will do it.
 
look at the still shot. there is absoluty zero fire around those nipples. none! if chain fires happened at the nipples you would get one every time a cap fell off or every time you only capped 5 cylinders. the only folks claiming chain fires come from the nipples are folks who have never had one and never replicated one but they read about it.
 
look at the still shot. there is absoluty zero fire around those nipples. none! if chain fires happened at the nipples you would get one every time a cap fell off or every time you only capped 5 cylinders. the only folks claiming chain fires come from the nipples are folks who have never had one and never replicated one but they read about it.
Yes, when I hear about chain-fire being caused by loose or missing nipples, I have to chuckle. This makes zero sense to me. Poorly sized or impropperly loaded projectile make a lot of sense.
 
Since 1986 I have competed in cowboy action events with several 1851 clones & 2nd Gen Colts. I've loaded all six chambers for each "stage" but only capped five. I load balls sized to give a slight ring of lead when driven in the chamber with a lubed wad over about 15 grains of 3F powder. In all the intervening years I've never had a chainfire. If chainfires were caused by missing or loose caps, I should have had a LOT of them, while in fact, I have had ZERO. But... if you believe the lore of rear caused chainfires, hold onto that theory... for it gives me an edge when you have a fouled charge or a required reload of one round!
 
Since 1986 I have competed in cowboy action events with several 1851 clones & 2nd Gen Colts. I've loaded all six chambers for each "stage" but only capped five. I load balls sized to give a slight ring of lead when driven in the chamber with a lubed wad over about 15 grains of 3F powder. In all the intervening years I've never had a chainfire. If chainfires were caused by missing or loose caps, I should have had a LOT of them, while in fact, I have had ZERO. But... if you believe the lore of rear caused chainfires, hold onto that theory... for it gives me an edge when you have a fouled charge or a required reload of one round!
The two chain fires I have had in sixty years of c&b shooting both happened on the same day using the same revolver.
pietta shooters models are reamed .456” and they suggest a .464“ or .465” ball. I only had .457” Hornady balls, had just received the gun back from the gunsmith who tuned and refinished it and I was in a hurry to shoot it. Chainfired immediately. I fired the remaining three shots without incident, reloaded all six and chainfired again. I cleaned up and got the proper mold on the way. That gun has been flawless ever since. Properly fitted ball or bullet virtually guarantees immunity from chainfires.
 
Since 1986 I have competed in cowboy action events with several 1851 clones & 2nd Gen Colts. I've loaded all six chambers for each "stage" but only capped five. I load balls sized to give a slight ring of lead when driven in the chamber with a lubed wad over about 15 grains of 3F powder. In all the intervening years I've never had a chainfire. If chainfires were caused by missing or loose caps, I should have had a LOT of them, while in fact, I have had ZERO. But... if you believe the lore of rear caused chainfires, hold onto that theory... for it gives me an edge when you have a fouled charge or a required reload of one round!
The secret is in the lubed wad and to a lesser extent in the tight fit of the ball although I strive for that.
A spark that gets past a ball will be stopped by a tight wad.
Never had a chain fire but have experienced full automatic fire because of over sized nipple holes. Great fun😀
 

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