A while ago I thought I had a barrel walking problem but it turns out I was mistaken and the rifle is perfectly fine. But in the process of figuring all of this out I had the action and barrel cryo frozen which they claim will cure such a problem. I figured it couldn't hurt and for 100 dollars I would double or triple the life of the rifle.
I've had the rilfe out six times and here's what I've found: As far as accuracy goes it changed nothing I can see (it was already plenty accurate), but the surprising thing is that it virtually eliminated copper fouling. I have put forty rounds through the thing so far and there are only a few tiny streaks of copper that I can see, whereas before the fouling was very obvious. Not that I consider a little fouling to be the arch enemy of accuracy, but for high velocity rifles that are more prone to a lot of fouling it may be worth considering.
In the meantime, I have spoken with people who swear it does reduce wandering barrels (including firearms factory representatives), and I've run across one legitimate case where it provided great results in accuracy improvement. At the very least I at least doubled my barrel life and cleaning is a snap. Just thought I'd pass it along.