OKFCO5, ArchAngelCD and the rest:

I loaded up some 4.0 grains 231, and problem solved! The rounds are as accurate as I can be, I also loaded some 3.6 Titegroup (my standard load), and 3.8 Titegroup, both worked well, with a slight nod to the 3.8 for consistency. The 231 is a little softer than the 3.8 Titegroup, but maybe not quite as accurate (but close)

I guess 3.1 of 231 was a little droopy for any sort of consistency, and was obviously not developing enough pressure.

Thanks for all the advice.