I know some of you guys are way better at looking at data and targets, and figuring out where to go from there. Me, not so much. I decided I would post a picture of the target and give you all the data, and see what advice you could give me. The load data was as follows: 1x fired starline brass, CCI 200 primers, IMR 3031 powder, and Noe 360-232 bullet. The bullet was cast on the soft side, 12 bhn. It had a gas check installed, powdercoated, and sized to .360. I ran everything over the chronograph, and the data from there looked good, but the groups, not so much.
I put all the targets together on one, to see if I can see patterns.
Group 1 is Blue. 37 grain charge. 2040 fps, ES 34, SD 18. 2 3/4 inch group
Group 2 is Red. 37.8 Grain charge. 2132 fps, ES 62, SD 27. 2 inch group
Group 3 is Black. 38.6 grain charge. 2161 fps. ES 53, SD 23. 4 3/4 inch group
Group 4 is green. 39.4 grain charge. 2221 fps. ES 41, SD 18. 3 inch group
All were shot at 100 yards off of sand bags. I just don't know what to make of this. Wrong powder? Something else? Rifle is a custom with a 1:14 Lothar Walther barrel. Reason I was pursuing these velocities was to increase range. Maybe I am just pushing too hard, but with PC should be fine in these velocity ranges. Here is the picture. I am open to critique and constructive criticism.