Thread: Tight chamber and marks on projectile

Autosol on a patch wrapped around a worn brush back and forth at the chamber end will get the carbon ring gone. Ideally you check it with a bore scope/endoscope, cheap as chips off the internet, $50 from pbtech or there are some on trade me for under $20 that plug into your phone or laptop.

Jaco has made a good observation, your brass isn't being sized enough. In your picture there is a line around the base of the neck that hasn't been sized, along with everything south of that. Not all shell holders are created equally so the rule of touching and then a quarter turn needs to be proven before assuming it's enough.

Micky also raises a good point that needs investigating.