I picked up a GSG 1911 in .22lr last week and took it to the range with my wife on Saturday. Both the manual and the LGS owner recommended HV ammo, so I bought 200 rounds of CCI Mini-Mags. I also brought my go-to .22lr ammo, Federal Automatch, just to see if the gun would run the lower-velocity stuff. After a good cleaning and lubing, we went to the range. With the Mini-Mags, we had problems that never went away. The first round would never feed properly, and we were seeing 2-3 additional malfunctions per magazine where the pistol would fail to return to battery. We had no light primer strikes, and the slide always locked back after the last round, but the gun was nothing but problems. Out of sheer aggravation, I loaded up a magazine of Federal Automatch, and everything fed and fired flawlessly. Thinking that maybe the gun was "breaking in", we switched back to Mini-Mags, and again would see 3-4 malfunctions per magazine. After 100 rounds of Mini-Mags, the problems never went away (FTRTB). With the 150 rounds of Automatch, sprinkled in between the magazines full of Mini-Mags, we had 100% functioning. Towards the end of the session, I think I may have realized the problem . . . The Mini-Mags I bought were hollowpoints with copper plating. The Automatch were round nose, unplated lead. I think the HP's were digging into the feed ramp, whereas the round nose Federals were gliding right in. While the Automatch are sort of in-between high velocity and standard velocity (1200 fps), they ran in the gun 150/150. Did I screw up by getting HP's, or could something else be going on? Either way, the gun is terrific with the right ammo.