Froggy, I've had 3 criterion barrels and all were excellent shooters. 2 in 260 and one almost identical to yours. 308 1/10 but 28" long. One thing I can tell you from experience with that barrel and several others is the 1/10 prefers the heavier bullets. The heavier I got the better it shot. Up to 178 is what I tried. Couple savage barrels in 308 shot good with 168-178 but not with 155 amax etc. This is my experience.

I do have a few that shoot lighter loads, 150 game King for example in my wife's 308. But that criterion just liked a heavier round. I also never use anything but IMR 4064 for 308. It plain works for accuracy. I've tried varget and it was ok for hunting but nothing like the IMR.