Ok, in my quest to die on this hill, I went out and bought the lightest, most recoiling 300WM I could find - a Tikka T3X Superlite without a muzzle brake. Weighs in at just over 6lbs naked, 8lbs with scope.
Paired it up with my Leupold VX6HD 3-18 scope, and shooting from a light sled. I've been slowly breaking this barrel in, and it had only about 9 rounds through it so far. This is the first batch of decent ammo I've tried. Hornady Superformance SST 180gr factory loads.
First group after 1 fouling shot:
It seems like I am capable of sub-MOA shooting, so maybe now I can send Bergara a link to these posts.
Thoughts on the new Tikka: Man, this thing is nice, and the weight will be a joy to pack around. However, this pencil barrel heats up REAL fast and shooting for groups is an exercise in patience after the first couple of rounds.
I'm going to thread the barrel and see how it likes my suppressor in the near future. If it doesn't, I'll go ahead and slap a brake on, adjust the trigger down, put on the pistol grip and see what ammo it likes best. Hopefully it's capable of 3/4 MOA!