Many believe that price is an indicator of accuracy in Barrels. Nothing is farther from the truth.
I have made a lot of rifles in my 1/2 century as a gunsmith. I have used barrels that run the price table from free to $600 and what I have found is that most of the very costly barrels shoot very very well, (but not all.) And some of the high priced barrel makers will give you a new one if the 1st one doesn't shoot very very well. (but not all)
I have also made a few hundred rifles with barrels that most snobs would not look at that shot under 1/2 MOA and one I personally own has a free barrel in it that shoots center to center groups so tight I don't tell anyone, but I will show them if they come to my shop. This rifle has a barrel in it that was a "take-off" so my customer could buy a $400 barrel to replace it. In my rifle I am getting groups that was far under 1/2" at 100 and my hunting load is the least accurate, shooting "only" 5/8" at 100 with 200 grain Noslers.
I made a 25-06 for a good friend of mine who later was dying, and left the rifle back to me in his will. it has an Adams and Bennet barrel we got from Midway USA when they were doing a clearance sale of them when they stopped selling them. It was simply a straight blank, and Bob paid under $30 for it. This gun shoots 1/2 MOA and that's not ever noteworthy with it. That is to say it doesn't shoot 1/2 sometimes, but every time if you don't wiggle.
I have installed about 40 barrels in the last 10 years that cost upwards of $500 and all have shot well but one was a disappointment to the customer who though he should get better then 3/4 to 7/8 with match bullets with it so he tried to get a replacement. Nope. The company said under MOA was good enough and that would be within their accuracy guarantee. He was mad when I was shooting my 270 right next to him on the line and getting 7/16 with my hunting loads in my 270 which has an ER Shaw in it that I installed a few years ago. That Shaw barrel cost me a bit under $100 back when I bought it. I also have one in my 375H&H that shoots tight "Micky Mouse Heads" at 100 and it cost me about 90 dollars back when I bought it.
So I am NOT saying the big money barrels are no good. No, far from it. I am saying that they are not necessarily more accurate then others that cost less then 1/2 of what they ask.
I see a comment that "Douglass" should not be in the list. Ok, that's the choice of the owner. But I have 2 Douglass barrels that shoot very very well. Back in the 70s and early 80s I had some time when I was somewhat interested in Bench Rest shooting. I saw a lot of rifles that had Douglas barrels in them back then. And many of then shot a tight ragged hole at 200 yards with 10 rounds. Many if not most of the high priced barrels today don't shoot that well, but the barrel is just one of many details that can make a rifle super accurate. the best barrel on earth will not soot all that well if the chamber is not perfect, if the bedding is not correct, if the crown is off perpendicular with the bore and if if if if a LOT of other things are not right.
So spending $500 to 700 is NOT some kind of guarantee that your rifle is going to be a "one holer"