Thread: Suppressors and carbon fouling - what's your got to fix ?

Originally Posted by Tommy

Do the groups revert to ~0.6 when the can is off?

Originally Posted by chainsaw

nope

That sounds more like copper build up to me or something is loose elsewhere.

Originally Posted by gadgetman

That sounds more like copper build up to me or something is loose elsewhere.

Yeh carbon build up at the throat, in my 6.5AI takes around 100 shots so I know that I need to dung it out around then I use JB's or sometimes Autosol. Prefer JB's. You can pick up the carbon issue if you have a Stoney Point (Hornady whatever now) seating depth gauge. You will find you cannot get consistent readings and they are also shorter than normal. Once cleaned the readings become very consistent again (around 1 thou of each other depending upon your technique). I also know when my AI is building up - I load with the projectiles touching the lands and I can feel the change with the bolt being a bit "notchy" when pushing it fully fwd b4 closing. Cannot say the C build up has dramatically affected the accuracy at the time (in theory it should have some effect) whilst Cu build up certainly does.