LI have a Cooper M24, 6mmBR 1-8" twist that shoots very well. Have had no problems with it and it shoots well.
Then there is the Kimber, Model 84, .308 hunting rifle. It has been returned to the factory 3 times in the four years I have owned it. One pillar was installed crooked, a burr was found in the bore near the muzzle, the magazine would fly open with first shot when it was filled, and finally, there were frequent misfires. Of course they did repair it each time, but just a PIA. Sorry, I have neither in a rimfire.