Seating depth test, grouping interpretation and where do I go from here?

[Brandon2002]

First, I apologize for the poor photo quality—I'm not too focused on presentation when it’s not crucial.
I’m a beginner shooter, this being only the sixth time I’ve shot, so my fundamentals may not be solid. That’s why I decided to test three different seating depths for each group. Based on my results, I see two clear contenders: G2 at 2.15" OAL and G3 at 2.16" OAL. I’m not sure if there’s anything else to be inferred from these groups.
For context, I’m shooting a Howa 1500 in 6.5 Creedmoor, using Berger 140gr Hybrids, CCI 450 primers, and 41.6gr of H4350 powder.
Given these results, which seating depth should I go with? Should I continue to refine in one direction or the other? I was originally loading at 2.115" OAL, but I noticed some inconsistencies at longer distances, which prompted me to run this seating depth test. It seems I was quite a bit off.

 

[Maurygold]

G2 - you want the least amount of vertical possible. They provided the best by and far for vertical while having good horizontal.

 

[JerkyFreak]

As a beginner shooter, load G2 and practice a few hundred rounds more.

Once you are sure the groupings in G2 are not just lucky coincidence you can start doing proper load development.

 

[Doom]

The best advice I can give has already been given by @JerkyFreak. Being a new shooter its very likely that you are the largest variable in the system. Likely greater than powder charge or seating depth or neck tension. This is especially true for shorter distances like 100 yds. My personal opinion is you should load to 2.800" COAL but more importantly just go with something.

While shooting consistently may seem simple it requires a lot of coordination of many actions that affect the on-target results. They range from simply getting the buttstock consistently in the shoulder to how hard the cheek weld may be to exactly how hard the rifle is placed in the shoulder pocket. Having only six range trips you likely don't have any consistency in this coordination. As you shoot more you will begin to notice a pattern in things like recoil direction, where the rifle ends up after the shot, and other things that should become more consistent.

For now concentrate on tightening up your groups and being more consistent in your shooting and concentrate your reloading work to being consistent in your preparation.

As note here on posting COAL and CBTO dimensions. While reloaders consider CBTO to be the dimension that matters for precision, it doesn't mean a lot in comparing one persons load to another. When you give that dimension it helps to give a COAL for at least one of the CBTO dimensions.