Carbon ring

[Link]

Would annealing seal the neck to help cut down on carbon ring ?

 

[Murray Brook]

I can't see how it would. The carbon ring forms ahead of the case neck.

 

[jelenko]

Just to confirm, the carbon ring forms on the beginning of the freebore?
In looking through a borescope, the slope/step from the neck to the freebore is completely covered with carbon and is a 'ring of carbon'. Since the bullet doesn't touch this area, I've been assuming that it doesn't matter.

 

[rardoin]

Just to confirm, the carbon ring forms on the beginning of the freebore?
In looking through a borescope, the slope/step from the neck to the freebore is completely covered with carbon and is a 'ring of carbon'. Since the bullet doesn't touch this area, I've been assuming that it doesn't matter.

If that ring builds up enough to contact the bullet and/or grow further into the freebore it will make a difference and can cause velocity/pressure to rise and become a bit erratic. A bronze brush wetted with your carbon remover du jour, of a caliber matching the freebore diameter, on a chamber cleaning rod will make quick work of of that ring with a minute of twisting and short stroking.

 

[gambleone]

I can't see how it would. The carbon ring forms ahead of the case neck.

Yes

 

[bobm]

If that ring builds up enough to contact the bullet and/or grow further into the freebore it will make a difference and can cause velocity/pressure to rise and become a bit erratic. A bronze brush wetted with your carbon remover du jour, of a caliber matching the freebore diameter, on a chamber cleaning rod will make quick work of of that ring with a minute of twisting and short stroking.

I tend to let carbon build up to the point of needing more than an oversize brush twisting to remove. I shoot some matches that I will fire 300-350 shots from one rifle and clean when I get home. For those stubborn deposits I made a brass tool to spin in a drill. I pre make the rolls from tough synthetic shop towels to fit my .284 necks. Wet them with Hoppes #9 and spread on a layer of JB. I use two sections of brass cleaning rod to keep the drill in back of the stock pad. Definitely use a bore guide. Spin moderately and press into the neck for a short time. The Teslong tells me when to stop. Carbon deposit gone. My factory and custom barrels get the same treatment as needed with no harm done.

 

[Link]

Run the borescope in from the muzzle end with a case chambered, pull the case out with your bolt. Just as it starts to move I see a little carbon under the end of the case. A fired case also has a '' sign wave''' of carbon that must leave a deposit of carbon on the chamber along with on the brass.