Thread Resurrection:
TL;DR - I'm starting to think there is something to this 'truing up the action' business. I'm on the 3rd barrel in this action that shoots identically to the first 2. WTF? Also, Criterion gets huge props for top notch customer service!
The TL;
So, I talked to Criterion about the 30-06 barrel asking if they had any tips/tricks/more things to try, and explained what I had tried so far, and they came back absolutely adamant I ship the barrel back to them. After inspection, they found nothing out of spec or otherwise that they thought could cause the accuracy issues I was seeing, however, they were't having it that I wasn't getting what I wanted out of it, so they insisted on replacing the barrel, not returning it. All else aside - that's absolutely top notch customer service, and Criteron goes in my book as one of the Good Guys(tm).
What I had really wanted in the 1st place was a 280AI in 1:8 twist, but Northland Shooters doesn't stock those, and I love me some 30-06, so that's what I got. Since Criteron would make anything I wanted, I opted for a 1:8 twist 26 inch 280AI sporter, which showed up at my door a few weeks later (again, top notch customer service!!!)
Good components matter, as do choices that are 'known good' for a given cartridge, so I started with:
Brass: Peterson 280AI
Primers: Federal 210M
Powder: H4831SC
Bullets: 162 and 175 ELD-X's and 160 Accubonds.
Seating depth: .020 off the lands (which in the Criterion 'match' chamber is perfection - bottom of bullet shank +/- a whisker of being exactly at the bottom of the case neck in all cases)
First trip to the range, I went with a modest charge of 56.3 grains and 162 ELD-X's and Accubond's on deck. Accubonds were horrible (north of 2 MOA), but the ELD-X's looked promising at just over 1MOA, but only for 5 rounds with a mean radius of .44, which would indicate a real 'cone of fire' closer to 1.75 MOA or so. Hmmm...
2nd trip to the range, heated up the 162 ELD-X load a bit to 58 (still well under max) for a velocity average of 2844, along with some 175 ELD-X's at 57 grains. It was raining and cold and windy and miserable at the range, so I shot at 50 instead of 100 (adjustable parallax, so not unreasonabe). 5 shots of each, all came in a hair over 1MOA, but again with mean radius in the 0.40 to 0.5 range.
3rd trip with a mix of 162 and 175's, the 162's (at 100 again) and ran 10 rounds of the 162 this time - which came in at 2 MOA, about what I had expected from the mean radii I've been seeing so far. 5 rounds of the 175 again came in a bit over an inch, but mean radius of .5.
4th trip with 10 175's, and they came in a bit over 2 inches... just for grins, i brought the 7x57 that day, and pounded 3 into one ragged hole of 0.25 MOA with a mean radius of 0.15. Nope, the boy can actually shoot, so it's not me.
I've stopped going to the range and am just backyard testing at 50 yards, and 140 NBT's, 150 NBT's, and 140 TGK's, all in the same ballpark for accuracy.
I have a hard time believing I got 2 barrels in a row from Criterion, in substantively different cartridges, that have both been almost identical accuracy profile. The OEM barrel had some rusty spots in the bore, so I never expected it to be that great, but it honestly shot about exactly the same - 1.7 to 2 MOA with good components, worse with less good components. So ever single barrel ever screwed into this action shot the same.... hmmm.....
Notes to re-hash for the people who will start asking the usual questions:
Recoil - this is a 10.3lb gun I'm running somewhat mild loads in, recoil is around 15-16lbs according to recoil calculators, identical to my 7x57 which is a laser beam, and less than my Stag Pursuit in 308, which is also doing very very well for me, and way less than my old 308 Tikka Lite with the 3-9 that used to shoot 1/2 inch groups for me back in Canuckistan.
Loading techinque - same dude doing the same things that get me really good to downright fantastic accuracy in some of my other guns.
Scope - that scope came off my Savage 7x57 (since sold) that shot 1/2 MOA, confident it works.
Screw torque - for all the things has been checked, re-checked, and re-re-checked.
Bedding - It's currently in a Magpul Hunter with the solid aluminum bedding block (previously have run it in a SPS stock that's been bedded with JB Weld - shot the same in that).
Scope Alignment - scope bases are very out of alignment on this gun, so I'm using Burris Signature rings with the inserts to avoid torquing the scope.
Scope bases: solid steel, properly loc-tited and torqued.
So.... unless someone's got some other ideas, I can't think of any possible culprits other than the action itself having some flaw that's contributing to very "meh" accuracy....
The only real test, I s'pose is to take it in to a smith and drop ANOTHER $200-$300 or whatever on it having it fully trued up, and try the exact same barrel and loads again, which I'm kind of loathe to do at this point after what I've spent already...
Anyway - that's my story - input from those more knowledgeable than me is more than welcome (and input from those not more knowledgeable than me is welcome also, as long as you're vaguely polite, LOL).