I’m curious, it’s hard to tell from the pic, was there an acorn stamp on any of the primers? It used to be the centrefire Truflare cartridges had plain unstamped primers and the rimfire cartridges all had an acorn stamp. It was common to get a box of one or another without any indication of what you were getting on the box, so you always had to check. I haven’t seen this in a few years though... All of my Truflare launchers are “convertible”. If you unscrew the locking lug the firing pin can be removed and flipped around to expose the rimfire firing pin. Have you checked yours?