Ultraman's M317 is an aluminum (frame/cylinder/barrel) AirLite. I wonder if anyone knows what Smith & Wesson has to say about recommended .22LR ammo for this weapon. With all the comments about different rounds, I have some doubts about the Hyper Velocity rounds like the CCI Stinger. I am guessing that the High Velocity (Winchester Super-X, CCI MiniMag) would be safe. My old M442was said to be not recommended for +-P .38sp's and it has a steel cylinder and barrel.
I am waiting for the M43C (AirLite Centennial .22LR) with similar construction, so the question is pertinent to me.
Cockerpoodle