Any "powder left in the barrel" was left as a small glowing ember, not fresh/unburnt/ready to ignite (itself).... and highly unlikely.seriously doubt that conditions and training prevented issues such as residual powder left in the barrel....
Again, steel ramrods used in every musket design I've ever encountered, don't engender shaving burning slivers off themselves and/or the surface of the bore. Just doesn't happen.....that came in contact with the steel ram rod....
While loading a musket might find the bore pointed at your own/someone else's head in the process, the ramrod never causes an ignition sliver of burning steel. A glowing ember of cartridge wrapper might ignite the powder when first poured down, but that's long before the ramrod is brought into play. And if the lubed bullet then pushes distributed powder up against a burning ember when rammed home... well then that's still altogether different from the ramrod igniting anything....and/or allowing the ram rod to be pointed at one's head.
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