Update:

I spent a working lunch at the range today to run through 5 more loads of H110 for group size. I started at 29.0 and worked up half-grains to 31.0. Best group size came from 30.5 but I'm going to load a few more to make sure that 31.0's opening up wasn't due to me. The 30.5 had 3 touching, one a half inch high/right and a 1" low flier due to known "pilot error".

I appreciate everyone's input. Truly part of what makes this a great forum!