Carbon Rings?

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Carbon Rings can increase chamber pressures. For that reason, they must be controlled to keep pressures at a safe level.
Favorite Short-Range Load development targets:
Shotmarker circle-cross target: cdn.shopify.com/s/files/1/052...
OCW Target (circles with orange diamond): accurateshooter.net/pix/ocwta...

[@ewathoughts8476]

I have seen a few barrels that people take to me because some factory ammo is producing nearly punctured primers and ejector swipes. I usually ask them for some of the ammo that is doing this and some that is not. About 80% of the time I can just remove the carbon build up at the position you illustrated and the problem goes away. Examination usually shows the case lengths of the various ammos differ by up to 0.025" (223 Rem and 5.56 Nato labeled). Clean the ring and even 5.56 labeled ammo works in most 223 Rem chambers until the carbon rings builds from the shorter necked 223 Rem ammo. Once the carbon ring builds again, the longer 5.56 crimped mouths have no where to go and of course pressure is going to build. Off the shelf tolerances being what they are, means every barrel has to be analyzed as an individual. No one rule fits all.

[@joem2554]

I'm more concerned about case donuts, then a carbon ring.

[@derekmcmurry4263]

I've been reading that the brass needs to stay as close to max length as possible, i.e., stop trimming 5-10 thousandths off the mouth of the case. I case that fits at max length, or maybe trimmed only 0.002 from max is more ideal. I've not had time to test this yet but it seems like it would help. I wrap a couple 1 inch square patches over the actual caliber sized bronze brush, coat the outside with Iosso paste, hook up the 24" rod to a drill and get after it. This is after I've used Kano Kroil or Free-All to aid with good spread of the paste. I make sure the patch covered brush does not enter into the freebore. Works for me

[@zachperrego2362]

I've had a pretty bad carbon ring before, and based on info I gathered from barrel manufacturers (Frank from Bartlein in particular), I took an oversized bore mop and soaked it in Boretech C4, left it in the throat area for an hour or so, then took an oversized nylon brush into the throat and manually turned it in place, also occasionally going back and forth around the throat area. That took care of it pretty good, had to redo that process a couple times if the ring is really bad

[@justinjager9595]

Great video as always! More please!

[@pstewart5443]

Lou Murdica addressed this in an interview from Erik Cortina. He said even a carbon ring 0.0010" into the mouth of the case can increase pressure rapidly. I try to keep the carbon ring out if possible. I prefer to see the ring right at the tip of the case point.

[@cw5865]

Great and clearest explanation yet...

[@tommykawasaki9676]

Solid advice

[@pevelyhomeowner327]

Thank you 🙏

[@conservativesniperhunter7439]

Very interesting Keith. How much below maximum case length do you prefer to trim your cases? 0.002”, 0.003”, 0.005” or more?

[@andrewthatcher1737]

Thanks for the informative video. I have a bore scope so I keep up with cleaning and I see if any carbon ring forms. Iosso nylon brush with a patch, bore tech C4. Push it in till you can feel the throat. Let it sit there for a half hour to an hour. Give the cleaning rod 50 turns and the ring is gone. Just a question Kevin, i see when you are conducting load development and shooting competition in F-Class, you use a shooting mat. What shooting mat would you recommend?

[@jmflying]

Great videos, I clean the carbon ring from my Vudoo 360 with BoreTech Carbon Remover it works great. .22LR match ammo being soft un-coated lead can be deformed and really effect accuracy.

[@DanielReyes-hz1qk]

I just clean that area every time I clean my barrel, with a slightly over caliber Iosso brush on a chamber cleaning rod and whatever cleaner I'm using at the time. Use a patch on a slightly over caliber jag or brush to get the crud out afterwards and it's good.

[@janosvadas]

This topic has been stopping me from opening my freebore up on my .260 Remington to allow seating my bullets at the boat tail and the neck.

[@madman432000]

Precisely why I always clean my rifles after shooting them, whether 3 shots or 20. It won't have a chance to build up.

[@mostrogolf22]

In my opinion, your explanation is logical, I buy it,😊

[@Johnny-jr2lq]

A very hard substance is correct like one of the hardest things in the world.

[@annahonorata990]

Good video.

[@richardkut3976]

Good stuff.

[@JimWooddell]

I wonder....if one were to polish the neck area...like down to 1-3 micron would reduce or eliminate rings? It most likely is more about temperature and welding carbon to the metal.