Hi Ron. The Shilen ratchet is showing a lot of promise. Dean and I shot it in the warehouse until we got cold. I have been shooting and tuning in my basement with great results. I had the barrel frozen before we fit and chambered it. I find it is much easier to clean. Two dry patches and most of the rimfire ring and bore is clean. The second wet patch shows little fouling. It looks like 2 dry patches and 1 wet will get the bore clean. Based on what I have seen so far I am going to have all my future barrels Cryo treated. It's to cold to shoot outside so will have to wait for warm weather.