the carbon ring

[lpreddick]

read tony boyer's book and used my new hawkeye and discovered CARBON RINGS in several guns. he suggest inserting a bronze brush one size larger than the caliber into the neck portion of the chamber and rotate multiple times then inspect with the scope. this works but the brass wears easily. tried a hoppe's product call tenex brush..very stiff ? plastic and it seems to hold up nicely, esp with a little jb on the tip. this baked on ring of carbon is tenacious! it occ comes off in bits and pieces. if left alone how deleterious is it to accuracy? boyer blames it for what he calls "stupid shots"...a flyer for no descernible reason. measured some 6x47 lapua brass and found a difference of .008 thous. if the shorter cases are fired first, they lay down a ring of carbon. chamber the longer cases and they have to impale the .008 of carbon which boyer feels can add more pressure to the neck and possibly result in more neck tension and affect accuracy. i can see this happening. i have felt an occasional tight chambering and assumed that case wasn't sized enough. could this have been a longer case's neck hitting the carbon ring? l will pay more attention to trimminmg my cases to the same length and see if a previous accurate load that for some reason won't shoot, begins to group tighter. so, carbon rings. anybody?[/quote] if i can see you, i can touch you. BANG!

 

[okey]

This a .204 with 2000 rounds down the tube. I let my coworker run 75 rounds down it before I cut it open.

Okey

 

[40X Guy]

I am having this carbon ring problem in my 6.5X47L, My cases are trimmed to an equal 1.839 and after 20-30 rounds that ring is back. Thank god for my Hawkeye. I am using a 7MM nylon brush with a patch wrapped around it and JB on the patch, I then took an old cleaning rod and measured where end of chamber is and marked on rod so I am right on the ring, then spin the rod clockwise about 20 revolutions and it comes out fairly easily, I have had to hit it twice a few times, but it does entirely come out, so its basically a chore I have to perform after each session with this rifle. It can be maddening. I am thinking my cases are a tad too short or could H4350 contribute to the buildup?
I am thinking if allowed to build up it would be detrimental to accuracy. Rest of my barrel is great and rifle shoots very well.

Frank

 

[fishbone]

I am having this carbon ring problem in my 6.5X47L, My cases are trimmed to an equal 1.839 and after 20-30 rounds that ring is back. Thank god for my Hawkeye. I am using a 7MM nylon brush with a patch wrapped around it and JB on the patch, I then took an old cleaning rod and measured where end of chamber is and marked on rod so I am right on the ring, then spin the rod clockwise about 20 revolutions and it comes out fairly easily, I have had to hit it twice a few times, but it does entirely come out, so its basically a chore I have to perform after each session with this rifle. It can be maddening. I am thinking my cases are a tad too short or could H4350 contribute to the buildup?
I am thinking if allowed to build up it would be detrimental to accuracy. Rest of my barrel is great and rifle shoots very well.


Frank

I don't know how long you have been using the brush/j-b procedure, but is the rifling lead retreating; having to seat farther out?

 

[40X Guy]

Just started using the JB/brush to get ring out, but only 359 rounds thru pipe. Original OAL measurement to lands is within .001 still. Doesn't seem to effect the accuracy, but its there non the less.

Frank

 

[chino1969]

okey:
Thanks for posting that pic. The carbon that is in that barrel is almost glazed on.

I read Tony Boyer's book and also have a Hawkeye borescope. My regimen, when cleaning, is to go after the carbon first. I've used Tony's method with excellent results along with a cleaner specifically designed to remove carbon. I was using Carb Out but have been having equal or better results with Bore Tech's Carbon Remover.

 

[lpreddick]

shot five guns this weekend and after cleaning the bore, i hawkeyed the chamber and all had a carbon ring. put the tenex brush with a little jb inserted into a drill and rotated slowly for about 25 sec, cleaned the chamber and looked in...clean as could be! cleaned one without jb and just as clean. no way a nylon or hoppe's tenex brush will erode the lands. with a little practice one can feel the neck portion of the chamber, spin slowly and clean. whatever the gap between the case neck lip and chamber end will foul with powder residue. the repeated firing of subsequent rounds just adds more carbon and apparently the high temperature(1500 deg f ?) bakes the material into a very hard "ring". this ring may well be the source of the dirty patches i got from a very clean bore after passing a bronze brush down it until the patches came out clean. next gun will be inspected for the ring, then brushed with the bronze until clean patches then reinspected and i expect to see no ring. we'll see.[/quote] if i can see you, i can touch you BANG!