Have used everything from .22 short to .44 mag; but my most used since it came out has been a Ruger Mark 2. I have 2 virtually identical mk 2 targets with the 5.5" bull barrels and volquartsen competition internals, triggers, and some other parts. One currently wears a 2.5x8 leupold and the other a holosun green dot. For most of the years I've had them, they wore iron sights only; but... my eyes ain't what they used to be.
