Well first off, thanks for putting up with all my troubles. As you remember my chrono data last time sucked. It was all over the place. Well I got back on the horse today tried again. This time here's what I did: Used same brass (R-P) Weighed each charge by trickling into scale Weighed bullets (they weighed all over the place, but I got 10 that matched) Didn't adjust the set die between rounds. Stood 25 feet from chrono Sun was directly over head 80 degrees out Elevation 3281 Results (thanks to AJE for the Excel spreadsheet) So obviously my data once again sucks. I think I can rule out my reloading, as I was so careful while doing it. The only thing that I can guess is that my chrono sucks, or I'm not shooting where it reads. Here's an interesting thing that happen today as well. While shooting some 45 that I loaded the data read: 1033 1062 783 796 800 800 800 807 1038 1043 This makes me think that maybe the chrono is just really sensitive to where I need to place the bullet. Maybe I got lucky in shot placement with the middle 6 rounds, as they look to be accurate. Are chrono's usually sensitive to where the bullet must pass through? Because honestly, at 25 feet the chrono was lucky to make it home. I don't think I could place shots better than I was. Well, what say you guys?