I use a borescopeI remove carbon after every outing. Copper when the accumulation is readily apparent. Not the same answer for every barrel.
If you aren't using a borescope then you really have no idea what is inside your barrel so some more information from yourself would make the question easier to answer.
First question : Are you using a borescope or trying to 'read' patch conditions?
After every match!In a 223 rifle how often to you guys clean your barrel down to bare steel ?
OK. So if you inspect it after every outing you know the accumulation rate of fouling and copper. Personally I remove all the carbon fouling after every outing and the copper fouling depends on the barrel. If it builds up quickly I clean it every 2nd or 3rd outing. If it builds slowly then I clean it when it bothers me but before accuracy declines.
My personal experience with. 223s has been that they are prone to build copper in last 1/3rd of the barrel significantly faster than many other cartridges. So every other outing to every 3rd outing is the norm for me depending on round count.
I've been told this more than once but it happens to me even with new barrels and no visible roughness in the throat from the reamer.Copper in the last part of the barrel is actually coming from the throat. The firecracking in the throat tears the jacket and the copper is atomized and then lays down in the later part of the barrel. The cure is to shoot periodic abrasive bullets to smooth the fire cracking. Fire cracking is like teeth on a file. It periodically needs to be smoothed and then performance will return.
where do I get abrasive bullets ?Copper in the last part of the barrel is actually coming from the throat. The firecracking in the throat tears the jacket and the copper is atomized and then lays down in the later part of the barrel. The cure is to shoot periodic abrasive bullets to smooth the fire cracking. Fire cracking is like teeth on a file. It periodically needs to be smoothed and then performance will return.
I used to clean a lot less, had a few good barrels go south prematurely possibly because of carbon buildup that eventually was very difficult to remove.Based on my preferences and experiences, the only way to clean is bare metal clean.
I clean often to make this easy. Every 25-50 rounds in a 22 or 6mm.
I’ve let some sluggish 6.5s go 100 and they were only marginally harder to clean.
But, if you do clean it, don’t waste your time by half assing it. Clean it.
Wipeout with Accelerator, Bronze brushes from Pro Shot and if needed JB or Iosso are the best items I have used that are still on the market.