Shot my BIL's new 457 .22lr Thanksgiving day. Great shooting rifle, really liked the Midas+. He was shooting Mini-Mags and it did ok, but it shot better groups with the standard velocity. The worse grouping at 50 yds was the Mini-Mags, next best was the CCI standard velocity, and the best was the Laupa Midas+. With the Midas+ it would just wallow out one hole.
Only thing I didn't like was the weight. That bull barrel makes it heavy for a .22.