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Bart B. · July 8, 2020, 02:51 PM

There's such disparity across 22 rimfire barrel cleaning frequency and methods because of the widespread quality of human marksmanship plus the accuracy potential of the rifle and ammunition.

Cleaning 22 rimfire barrels once every 50 round box has been normal for top ranked competitive shooters for decades. That's when accuracy at 50 yards degrades to .4 MOA or .8 MOA at 100. Accuracy is defined as biggest 20 shot test group fired. Some use 50 shots.

Popular methods are a few wet patches pushed out the muzzle then a bronze brush back and forth several times in the bore. Finally a couple clean patches to push the crud out.

Rimfire barrels today last about 30,000 rounds before needing set back a couple inches or replaced if you insist on match winng accuracy.

July 8, 2020, 02:51 PM	#3
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	There's such disparity across 22 rimfire barrel cleaning frequency and methods because of the widespread quality of human marksmanship plus the accuracy potential of the rifle and ammunition. Cleaning 22 rimfire barrels once every 50 round box has been normal for top ranked competitive shooters for decades. That's when accuracy at 50 yards degrades to .4 MOA or .8 MOA at 100. Accuracy is defined as biggest 20 shot test group fired. Some use 50 shots. Popular methods are a few wet patches pushed out the muzzle then a bronze brush back and forth several times in the bore. Finally a couple clean patches to push the crud out. Rimfire barrels today last about 30,000 rounds before needing set back a couple inches or replaced if you insist on match winng accuracy. Last edited by Bart B.; July 8, 2020 at 03:02 PM.