Solid brass .22 dummies

Happy New Year to all collectors. In digging through a miscellaneous box of goodies I had stashed away found two solid brass turned .22 dummies with a small D headstamp. Apparently when I purchased them was talking when I was should have been listening and do not see that I entered them into my purchase book. Anyone have an idea? The head of one is clean the other has 5 firing pin strikes.

Sounds like they may be .22 snap caps, or were used as such. The “D” h/s may be for Dominion.