Thread: tidy up crown on .22lr

If doing the abrasive method, a 3m earplug inserted level with the muzzle works as a really easy plug. Doesn't get in the way, and keeps the abrasive paste where it should be. Push it out with a cleaning rod, and 99% of the abrasive compound goes with it...

A brass round headed screw of the right size will do this in only a few minutes, you don't need to do much to clean a crown up sufficiently. If there is damage, counterboring is probably quicker but I try to be minimum-invasive to start with and step up to the more bubbafied options as the first options don't work haha.