I recently read some things about loading for the bore rifles in a DGJ article by Ross Seyfreid from the Winter 1999 issue. He said the majority were built for use with round balls and paper cases. He felt it was most important to do a chamber cast to get chamber and throat dimensions, and to check the rate of twist of the rifling to determine the most suitable projectile, and whether it was built for paper or thin brass cases. He seemed to think black powder was the one and only propellant to use in the bore rifles.
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