The more rounds mine shoots it shoots more consistent . It likes a fouled barrel . I think these barrels need to season . I have 220 rounds down the tube now and it is really settling down .I have been pulling the snake thru after 30 rounds until I figure it out . I shot some 25 grainers today for the first time and they open up to 1 3/4'' to 2'' groups . the 20 grain stays right around 1 1/2'' at 100 yards .

You could take a nylon brush and some JB Bore Paste and polish the chamber a little bit . It won't hurt anything . I did it to a 22 mag with extraction issues and it cured it after I checked every thing over several times .

The second batch of 20 grain I purchased was full of low powered rounds with a noticeable low report that would send some wild fliers spoiling decent groups

Overall I like the gun for what I plan on using it for . My shots are normally 100 yards or less where I hunt .

I didn't realize you got it that hot . We are all learning as we go with these .

I don't have a lot of faith in the Winchester ammo so far . Hopefully CCI will step up and make it too . I had a lot of trouble with the Winchester 22 mag 34 grain with split cases and weak rounds . Its awesome stuff if you get a good batch . I went back to Maxi Mags .