I worked with another 22 caliber round in this velocity range. 22BR with a 35 grain Berger at 4400fps. that velocity is very, very, very, hard on barrel life. The data I got from Accurate Reloading said I would get 1/2 groups, and that was all I could get. I have 22BR loads that are 50grain at 4100 and get 1/4 or better. so why burn a barrel for so-so accuracy!
I thought the Cheetah (or CHeetah) a 243 Win necked to 22. That is way overbore. But if you can get it to shoot, it should be a laser beam on ground hogs!
Ivan