I don't think guns like the Sharps are terribly susceptible to cook-offs, given the nature of the loading. In a Sharps, the fresh cartridge is pushed into the chamber bullet first. While not a tight fit in the Sharps chamber, this allows the lubed bullet to mostly push any remaining bits of cartridge out of the way on its way in, and possibly snuff them out also. I did, however, opt to not use nitrated paper with my Sharps cartridges, in part because the nitrated cartridges are far more susceptible to ignition from a spark than regular paper. Also I discovered that 17 pound vellum paper blasts to bits so well that the extra work of making nitrated paper was not necessary.
This is quite different from a revolver combustible cartridge which will be loaded with the most flammable portion first.
Steve
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