Jam to reduce carbon ring?

[rimfiremac]

Assuming the root cause of carbon ring development is blow by during the initial combustion segment getting plated into the grooves by bullet engraving, are there any 'jammers' out there who have noticed they don't have carbon ring issues when jamming compared to the usual variety of jump distances?

 

[moondog]

No

 

[rimfiremac]

Roger

 

[6bra1k]

no... to refuce carbon ring you need to shorten the gap between th eend of the case neck and the end of the neck of the chamber. i use long brass, trim every time and run a .005/.007 gap

 

[RegionRat]

It would be an interesting assumption to test?!?

I have helped clean carbon rings out of friend's rigs, but have never had one myself.

When I quizzed them to investigate how or why the carbon ring formed, they couldn't explain it. I can say they typically were not deep thinkers or super serious shooters, so they didn't keep good track but none mentioned anything I could peg as a pattern. (ETA: I didn't check for @6bra1k concept, that requires being prepared and this always happens when club mates walk up on me.)

"Does anyone claim to know how to generate one on purpose"... would be a fair question to ask, then we could at least test the assumptions.

It wouldn't be cheap testing unless someone were to agree to just run the gun a certain way without just burning ammo for this purpose alone.

 

[moondog]

Less gap would mitigate the carbon, but it still happens. Just get after it at each shooting/cleaning session. Letting it go is what causes issues. A Borescope is your friend.

 

[Clancy]

A good and regular cleaning regimen is the only way I know to keep a carbon ring out of your barrel.

I love to clean barrels. I like cleaning and restoring lots of things though.

Not you, but some people think it’s cute to go hundreds of rounds between cleanings. I’ll never understand that.

 

[D-4297]

Just thinking out loud , but I think carbon ring development may occur more commonly in F-Class , than other disciplines due to the number of shots fired in a "String" , multiplied by three for a sixty shot match . The heat being put on the barrel during the "String", plus allowable "Sighters" , and then the Cool-down between Relays . To combat this ; I generally use a brass brush on a short piece of cleaning rod in a Drill , run at low speed , with my normal cleaning solution ( C-4 ) in the neck chamber area , after more than fifty practice rounds , and every Match . I probably spend more time and attention on the neck / chamber area , than the bore , in that respect . Knowing the problems a caron ring can create .

 

[jelenko]

some people think it’s cute to go hundreds of rounds between cleanings. I’ll never understand that.

Me neither. It often comes across like a 'manhood' claim.

 

[shoot4fun]

If you look at a 22LR chamber and a centerfire chamber I believe you will see why the carbon ring always turns up in that same place. A 22LR chamber can take usually thousands of rounds without carbon ring but not so with a centerfire of any caliber. Looking closely at a comparison it appears to me the 22LR chamber transitions directly from body to bullet. In other words there is no "edge" of end of the chamber as on a CF rifle. That carbon produced in a 22LR flows without being "trapped" by the end of the CF chamber where it steps to cut the throat and leade.
@6bra1k notes leaving less of a gap between the end of the case mouth and start of the throat will lessen the amount of carbon that can be trapped there.
There is nothing to be afraid of with carbon rings, especially so for us bench resters. We clean often; maybe too often. The F-Class guys I would think have longer strings of fire and, depending on how far your load pushes the pressure envelope, a ring could mean bad juju.
***NOTE*** I am not as smart as I think I am sometimes so take all this typing for what you paid to read it.