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The consensus seems to be that ill fitting nipples are responsible for most chain-fires.

One of the problems is that the Italian pistol manufacturers buy their nipples from a sub-contractor who seems to have trouble holding the tight tolerances required for nipples.

Another problem is that the American manufacturers of percussion caps have never agreed on a "standard cap size" and their caps are slightly different in size from manufacturer to manufacturer. Hence, how well or poorly a percussion cap fits on the nipple of your Italian made revolver is dependent on chance.

So, it is no wonder why we have so many chain-fires because of loose fitting caps. An alternative is to replace your Italian nipples with American made Ampco nipples that are designed to specifically fit the Remmie #10 percussion caps.
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