sometime in the late 70s or early 80s i believe,,a company named,,R.M.A.C. put out a little .22 muzzleloader,,
it has a little turret type arrangement on the top pf the barrel,,you loaded it with ffff and a .22 ball,,,then in the turret thing on the barrel.. it has a place where you were supposed to put the regular type paper capgun caps,,,i thing you were supposed to use 3 or 4 caps,,
it worked fairly well,,,and i shot it a lot,,,i still have it,,but havent shot it in years