I had a Kimber 1911 conversion in Mach2 that was a pleasure to shoot, but would fire slightly out of battery and bulge cases every so often. When I sold my .45, I also sold the converter and later sold about 1800 rounds of ammo I had picked up at bargain prices. Probabbly the most accurate pistol I've ever shot, but a little scarey.
The rifles and ammo were so accurate that there was talk of them replacing .22s for match shooting, but nothing came of it I guess.
A large percentage of the guys trying to convert Ruger 10/22s to shoot 17HM2 had pressure issue that ran from bulged cases to blown out cases that caused damage to the rifles and the potential for injury to the shooter. Lots of stories over on RFC, but when shot in a bolt action rifle 17HM2 is capable of shooting very small groups and the trajectory out to 100+/- yards is as flat as the 17HMR. The 17HM2 is one area that I agree with Layne Simpson on.
