I prefer the older K factory target grips to anything other than good single action Colt or well done custom Ruger SA grips. Ive tried many times to like the magnas but just never felt as good to me as the targets.
At one time I had a 4" 22 Combat Masterpiece and 6" K-22, the 6" would shoot several bricks of the old waxy Winchester Wildcats before getting too gunky to chamber easily, the 4" gun would get sticky in a brick or less. For myself, id have little problem with polishing the chambers out a bit to make it more user friendly. The 6" gun had zero problems with accuracy, so I dont agree that one will harm the accuracy by polishing them out enough to be easier to use when Ive seen nearly identical guns, one tighter tan the other, both shot outstandingly.
This was kneeling at 25 yards, and about what Id expect at any given time from the 6" gun. This was my normal when younger, In the past I sold many guns that didnt shoot any better than 3-4" @ 25 yards. Shooting weed and grass stems, and other tiny things at various distances was fun, but didnt pose real challenges. Shoot a few 10Ks of rounds through it and stuff thrown in the air gets to be doable. Running rabbits, squirrels way up in the trees, no problem.