New To Reloading Question

[PeteS]

Not too shabby for a new reloader !  I'd go for the 29 grains under the 105s and the 29.3 grains under the 108s and work on it from there. It looks like the rifle is capable, and so is the shooter!
Speaking just for myself, as soon as I get in the 1/2 MOA territory I usually move out to 200 yards and shoot an OAL ladder as the extra range seems to help me helps sort thing out.  Before I had a "good" scale, I would often lean toward the load in the middle of the tightly grouping powder range, figuring that scale error would be less significant that way.
When accuracy is very close between loads, I'll always start working with the lowest charge that makes the grade and start moving even farther out. The choice between the H105s and the B108s may be more about how how they fly in the wind at longer ranges. rather than a tenth of an inch at 100 yards.

Thanks for the response, I'm definetly gonna go to 200 next.