I’m not advocating anything, other than if we don’t have a large data set on an item or topic, it’s probably not true. I was a psycho barrel cleaner for most of my life. It’s how I learned and what was common knowledge. Then I started shooting multiple barrels out a year- at some points a barrel every 2-3 weeks. Combined with learning what grouping really means, it didn’t take long before the “why the fugg am I wasting time every day cleaning, when this barrel is gone in less than a month” came out. So, as long as it shot fine, I stopped cleaning. Because of so many barrels beforehand, I knew what the barrel life should be. Funny thing was when I stopped cleaning, barrel life was identical, or longer. The best part was that the static zero that resulted, and velocity loss is steady and generally consistent.
Volume. That is how I know it does it. In an average year, I will see around half a million CF rounds fired by those I shoot with. I personally will average between 35k and 65k a year combined. Most of these are 5.56/223. A bunch is 308, quite a bit of 6.5 CM, and a few thousands of 300 and 338 magnums. Add in hunting rifles and there’s another 20k+ of various chamberings.
Each gun has a purpose and for that purpose there is an allowable precision cutoff. When it goes over that cutoff, it gets replaced. If the allowable precision is 1.5 MOA for 30 rounds, and the gun is shooting 1.3 MOA, I don’t care if the gun would do 1.2 MOA if I cleaned it every 20 rounds. As long as it meets the requirement, I don’t care what the bore looks like, only does it stay zeroed and does it meet spec. If so- I’m not wasting time cleaning.
I’m not telling anyone to not clean. I’m saying that if you haven’t personally shot multiples of like barrels out, chambered in the same cartridge, shooting the same ammo, tracking precision with statistically relevant group sizes and zero shifts, both cleaning and then not cleaning at all- then your information isn’t real. The key here is- no one I have ever met except those I shoot with, has done so. No one that advocates cleaning regularly has ever taken a barrel 3,000, 6,000, or 10,000 rounds without cleaning and tracked it the whole time. They shoot 3 or maybe 5 round “groups” and as soon as one or two go over whatever size they believe the gun shoots- out comes the cleaning rod. Then they soak, and scrub, and patch, and when it’s perfectly clean they’ll shoot again. Usually it needs quite a few rounds through it to start shooting good again. They get a couple good groups, ignore the rounds they don’t like on the target, and exclaim it just needed cleaning.
I have yet to see not cleaning cause any issues in reliability, longevity, or safety. Cleaning a barrel before it stops shooting, is akin to wiping ones butt before they poop.