Ya gotta love it when a plan comes together. That is an awesome group, and youve put in your time to get it there. Im doing the same now with mine, and starting to second guess my decision, on the powder, that is starting to show promise, which is the RL17. It is known to cause fire cracking in the barrel. Not sure about the RL16. I kinda think im going to play with the Varget a little. At first, I thought it wouldn't be the best choice. It's served me well over the years, in .308, all the way up to 178 grains.
That is an awesome group. Glad that you were able to get it to shoot, and stay inside your OAL limits. Great job.