[Axenolith]

Could conceivable use a paper cartridge and glass or ceramic bullet...

[Chode]

conceivable but not usually available to the common criminal, and for a high tech assassination with only ONE shot, i'd want a known commodity...

that and you'd have to redesign it like a black powder weapon so the primer pocket and primer are part of the barrel

[skimbell]

"Could conceivable use a paper cartridge and glass or ceramic bullet..."

Or the ol' standby...

I did a ton of Indians and outlaws in with these when I was much younger.