Strange patterns at various setbacks from lands

jeffpatton00

Private
Minuteman
Mar 31, 2017
21
2
I'm testing loads for a new Wylde .556 barrel, in this case varying setback off the lands and holding everything else constant, and I shot these groups with what seem to me to be strange patterns - most are fairly vertical in nature, but at 20 thousandths off the lands, the group is distinctly horizontal. Any tips for what could cause that, and what would you suggest trying next to develop a load for this barrel?
 

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Your barrel doesn't whip straight up and down, it does a circular type motion (more like oval) snd horizontal dispersion is normal too.

did you do a powder charge test at all? I don't think you're in a node yet