Couple of things about that PMR-30.... I remember a review done a few years back, by Hickock .45....granted, he is a better shot than most pistoleros, but he didn`t seem to have much trouble hitting just about everything he aimed at.
Also, IIRC, that thing only takes the .22 MAGNUM round, which ain`t exactly cheap, especially when you`re dumping out 30 rounds at a time....
Yeah, you can't shoot anything but .22 mag out of the pmr 30. The problem is any .22 mag ammo my friend tried was tumbling, producing keyhole shaped holes in the target, even at close range. This was not uncommon at the time, many people had that problem. I dunno if they fixed it, but I wouldn't buy one until I could verify it didn't do that.