We have a winner!
However I think the development was a little earlier. Maybe 50 yrs ago
I’ve been trying to talk the owner out of the rifle that this was meant for, but haven’t been able to shake it loose.
It’s a 35-40 lb. percussion slug-gun (i.e. BP Benchrest) with all of the accessories. False muzzle, paper patch starter, bullet starter, molds, alternate ignition that uses shotgun primers (in addition to the regular nipple), ramrods, cleaning gear, etc. The only thing missing is the long powder funnel that deposits the 120 to 140 gr. charge at the bottom of the barrel. A couple of the targets with it show it shooting about 1- 1 1/2 moa at 200 yds. (or so it says on the target). It was made by mid-west gunsmith in the 1950-60’s (yes, 19xx) and was featured in American Rifleman around the same time.
Dean