I cleaned with Shooters Choice and one of the good copper cleaners and abrasives when I did.
Buttoned tubes would be tossed at 3500 rounds, cut ones start suspicious at 5-6000 rounds.
I"ve had them hold just around MOA or over to over 12K rounds once just on an experiment, but it was getting hard to continue winning matches and such with a gun that innaccurate.
Cleaning wise I could see a degrade in accuracy around the 500 to 600 round mark, enough so that I was anal enough to clean at that point.
But long gone are the days of cleaning our M14s every night, even if only 30 shots fired.
Granted I demanded and expected a bit more accuracy than most would.... IE when the gun was shooting larger than 2 inches for 10 shots at 300 yards it was high time to clean or rebarrel...
