I have shot quite a few through my Mk III, and they seem to shoot pretty good. Don't have a chrony, but they are squirell killers at 25-30 yards. As with many rimfires, you may have to experiment to see what shoots the absolute best, but hey, it's cheap! And even the "worst" seem to shoot very well. I think that you will like the MK III, I know that I do.