I had 2 factory Remington sendero barrels and actions cryoed back 5 or 6 years ago. No noticeable improvement in groups, seemed a waste of time and I haven't tried since. Pete I still lust after your 22 sporter.
Yes Krieger freezes there blanks before machining. They use to double freeze there blanks, one before machining and the again after. Last year I had a Brux barrel froze, and I can see a difference. I own a couple of other Brux barrels, and the one that I froze you can feel a difference when cleaning it. I will also say I have only shot a few rounds out of it, it is still in break in. I shot it in a club match last year first time out of the box, and without much load development, and won the match. For the $40 to $50 bucks it is cost effective enough, and heck it can hurt anything.
Accuracy-wise, if you meant to say "it CAN'T hurt anything"........talk to shooters who had their good barrels cryo'd back when the cryo-craze first started some 15 years ago.....Well, let's just say not very many were repeat customers..
Ok, hopefully one of these dissatisfied customers will come forward with there claims, and have proof to back it up.
. Blackstar couldn't do it 15 years ago when they offered a cash reward for winning a registered match with one of their barrels.