My second Seekins rifle that has issues

[Durable Gun]

I’d probably call it a done deal and load a bunch. But if you’re going down the rabbit hole.
-What was the wind like? May account for some of the horizontal stringing.
- Did you track the velocity and specific impact point of each shot? You can then see if velocity spread is happening on the shots landing farther out from the norm.
- Did you do any prep/sizing to the new brass? Could have some neck tension variances.

I’d load up a bunch more with once fired brass. Shoot a group again and see what it looks like. It looks like it was holding 2 separate waterlines and I’d be curious if the vertical dispersion was ES related or shooter/mirage/environmental related. The gun is going to have its limits, but the patterns look too distinct to be just dispersion.

Thanks for your informative response! Wind would pick up slightly at time of the day but seemed calm when I shot this string. I noted each shot’s fps but did not note which shot was what. I did set the neck tension on the brass. I will take your advice and pursue further with it. I appreciate your time! Thanks pal