I ran the MIM-Rock in a steel match this morning. The first stage was a disaster, but it was the ammo . AutoMatch used to be great but this box was misfiring and failing to cycle the action. I switched to a different gun for the second stage, and it got even worse.
So I switched to Armscor ammo and they ran flawlessly until I ran out. Then I broke out the Mini-Mags and they ran flawlessly too. (I usually save those for tree rats) Then after the match, I ran some plate racks with various ammo, and even the usually terrible Remington Thunderbolts ran great. I have a lot of AutoMatch, so I'm hoping it was just that one box.
On the close targets I was keeping up with the race guns with some times less than 2 seconds. I was having some trouble hitting the smaller and farther targets though.