The weather has been awful, so I've been in the reloading room. I came up with an accurized hot glue bullet to shoot with primers only. Very quiet and because of the .22 pellet in the nose they are very accurate.
I simply dropped a pellet in a bullet mold, squeezed it closed, and shot hot glue in.
They load from the magazine just fine, but of course won't cycle with no powder.
I'm thinking this would work well for other handgun calibers. I will likely try some 9mm Luger next.