Bit of an update here. I got the action in my F/TR glass bedded, and torqued the action screws to 35/35/25 in-lbs. At first, the results did not seem to be any better.

I ended up redoing my loads for the 168gn Sierra MatchKings, in the end going up by 0.1gn (to 45.3gn) made all the difference. I entered a 700m competition, and I shot 94.1 out of 120 in very windy conditions. My score was quite comparable to most of the other guys - many of whom are much more experienced and using some pretty expensive gear.

Also, out at my local range, I shot a 3 shot group of 0.19" at 200 meters (220-ish yds - that's 0.08 MOA). I stopped at 3 shots because I didn't want to stuff it by trying to get another 2 in there. Also shot a 5 shot group at 0.78" at 200m, but I know I can do better than that. Will be trying my hand at 10 shot groups next time.

All-in-all, I couldn't be happier. I will give it another 1000 rounds, then look at rebarrelling to 6.5x47 Lapua.