I consider, as do many folks, CCI MiniMag ammo as high velocity ammo with a muzzle velocity of 1260FPS. Of course, you may do as you choose with your Erma, but if it were mine, I would not use the MiniMags. Your Erma functions with subsonic ammo, so it should likewise function with std. velocity .22 ammo, that it was designed to function on. Again, it is your pistol, and your decision to make.
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