Lawnboi
WKR
Your gun will tell you when to clean, and every gun is a different collection of chamber size, bullet, powder, barrel condition, etc.
Tight chambers don’t have as much physical room or clearance for carbon to build up - an old factory chamber will shoot many hundreds or thousands of rounds and probably not cause problems. I love buying newish Christensen Arms barrels that guys pull off because they don’t want to clean and the built up carbon screws with their accuracy - the snug chamber contributes to good accuracy, but they have to be cleaned.
Those statistically significant groups you guys claim to shoot all the time will start to go to hell and that’s your clue it’s time.
It’s easier to clean more often and not wait until it only shoots 2 moa right before a hunt and none of the crappy solvents you have will remove the stubborn carbon ring. It’s also easier to use a cheap borescope to see if your cleaning has actually removed the carbon - you don’t even need to buy it, just make friends with someone who has one.
I think the resistance to cleaning comes from elaborate directions and thoughts of lots of unneeded elbow grease. Just soak a patch and run it through.
I have a plastic set of $10 magnetic jaws that go in the vice in the garage that clamp the barrel - insert a simple bore guide, grab the cleaning rod and put on the correct size plastic brush to hold a patch, use a medicine dropper to add a squirt of solvent to the patch, run it down the bore and let it drop out the end. Done. Wait 5 minutes and repeat until very little green comes out. Run two dry patches and bore scope it. If theres a carbon ring that hasn’t come out just keep repeating, maybe run a brass brush each cycle if you have to, or change to a better solvent. When you’re finished, run two well oiled patches then two dry patches, make sure to wipe anything out of the chamber and you’re done.
It literally takes longer to type this than clean a rifle. Having a can doesn’t matter - the patches just go one way.
Even the carbon ring in this photo doesn’t look large enough to actually contact the bullet, but it might.
View attachment 651917
Correct me if I’m wrong, but what im looking at dosnt seem to be what I have understood what a carbon ring is. To me the carbon in the photo looks to be in the neck portion of the chamber, not the freebore where bullet contact may happen.
That carbon can be a pain to get out as well. And can cause issues if you let your brass grow