Carbon ring.

[Jerryrigged]

The steel case method will only handle carbon that exists up to the case mouth area. Would have to sort through a few cases to find one at/over max length. to use.

 

[hm1996]

Doesn't anybody use a chamber brush with solvent?

I use an old cleaning rod section w/45* bend on end w/a loop type rod tip, patch w/Tactical Advantage and have had no problems w/buildup in chambers.

 

[Damon Dog]

There’s a good YouTube video of a guy using iosso and it looked to work great. He first used wipeout and that did little to nothing he then used to iosso and it was night and day. Would be worth the watch.