I've had a 42 for a couple of months now I guess, but most of the shooting I've done has just been load development over a chronograph. I think I've settled on 2.9gr Promo with 100gr Xtreme plated, which gives me about 880fps and seems to operate the slide reliably. I've got to say though, this is by far the most difficult to shoot Glock I've owned. I think the problem is, there's just so little to hold onto. At least a couple of times, I think my right thumb has hit the slide stop during recoil and locked the slide back. My usual two hand grip puts the strong side thumb parallel and on top of my support hand thumb, both on the frame pointing downrange. The 42 just doesn't seem to have the real estate for that. Do you have to use some alternate grip with the 42 due to its lack of size? I think because of the difficulty I have getting my hands in position on it, I'm having trouble holding it firmly and more shots than I'd like are going way low (6" or more low at 7yds). That's not going to do when the D1's are out at 15-20yds. I haven't even tried practicing Glock-the Plates with it yet. I'm kind of amazed I haven't hit the chronograph with it [yet]. I'm hoping to shoot it in St. Augustine in November, but not sure I will if I'm not confident I can hit the far targets with it.