Several years ago I bought a CZ 452 Varmint from the classifieds here. I have shot it off and on since then with no particular attention paid to ammunition it shot well but not spectacularly. A while back I bought a 17 cal cleaning kit and finally got around to using it. My first trip to the range after cleaning was interesting. I ran 5 or 10 rounds of Remington thru it then changed to a new brick of CCI standard velocity that was given to me. The first group at 50 was good, the second went to .6 and is now consistent there. With a proper rest and and a target scope I think the groups will shrink even more. The seasoning process was fascinating to watch/experience. I’m not changing from the CCI standard. The results are too consistent and good to dink with, no flyers, etc..
