Mud, I can see this getting into another pi$$ing contest with you and I'm not going there.
I'll repeat... you can build an accurate rifle off of any action.
That said, some actions tend to have more "issues" and need more work than others which require more cast.
There are a number of ways to weigh the quality of an action to include, fit and finish, appearance, safety, precision machining and craftsmanship, and function.
Specific features to consider include bolt design and construction, extractor type, ejector type, firing pin construction and function, gas porting, type feed, recoil lug design and construction, trigger/safety design and function, receiver design and strength.
No one action has all the best features, design and construction. You can probably find a feature from any one action that is superior to other actions, except maybe the 700. It's an overall good or OK action, but it doesn't have a single feature or component that another action isn't superior to.
I've been reading these threads for years and and 95% of them boil down to a bunch of subjective gobilty goop. I don't care what my Granpappy shot, bless his soul. I'll treasure his gun because it's his gun but that's where it stops. And I don't care that my cousin Billy Bob headshot a deer @ 300 yds with his blankety blank rifle. Some people just do not know how to separate the subjective fantasy world from the objective REAL world. Oh well... That's not me. I don't give a flying spaghetti monster what label the product is wearing or where it was made. I care about one thing only and that's quality and results... I guess that's two things.
So I am going to give you a little anecdotal example of "looking under the hood".
I had heard many great things both in person and on the internet about Sako's. So a few years back I was looking for a new "go to" hunting rifle. Looked at a bunch and got offered a good deal on a really cool looking Sako M85 Finnlight 300 WSM. the action was about the sweetest action I ever worked and it "looked" SWEET. I did not really understand what I was buying at the time but I was to find out the hard way over the next couple of years. You Tikka guys might want to pay attention to this as well.
So I get my rifle, work up some loads and start shooting to see what's best. Nothing is good. My groups are 1 1/2 to 3 MOA. All loads are inconsistent and not one is better than another to include factory loads.
I send it back to Beretta because it has a 1 MOA guarantee. They send it back saying they cleaned it and fired it and there is nothing wrong. I take it back to the range several more times with various loads and same thing. BTW it is wearing a NF NXS scope which I have used on a 300 RUM to shoot sub 1/2 MOA groups. So it's not me and it's not the scope.
So I send it back again. And they return it again saying the same thing and tell me they are going to charge me if I send it back to them again. I am NOT a happy camper now. So I turn to the forum for help and this is what I learn...
No Recoil Lug - What say ye?
Moral of the story... Disregard marketing and endorsements by subjective brand name lovers and flag waivers. Now it's true that a lot of Sako's and Tikkas shoot very well, but I found through this long process that there were a lot of guys like me that got raped by Beretta with poor performing Tikka's and Sako's.
ATM, this rifle is at the smith getting a $200 custom made recoil lug. Mot really sure if that is the problem or the barrel. i will find out through and expensive process of elimination.
One thing I do know is, I will never but another Tikka or Sako based on their recoil design and CS.
After this experience, I started 'looking under the hood"