I've been pretty lucky with .22 magnum accuracy. I've had 3 rifles in .22 mag, a Winchester 61M, a Ruger 77/22 boat paddle, and a Winchester 9422. None were MOA guns but all 3 were reliable 1.25 MOA guns. My Contender barrel (10", .22 LR SS match barrel, punched to .22 mag) is in that same category.
The only inaccurate .22 mags I've owned have been revolvers. Single Sixes ... 2 decent, a dozen not. None worse than the S&W 648 I had briefly though.
Tom
