Carbon falling into the chamber

[acochran]

I’ve had it happen as well. I could still chamber a round, but the cases were coming out with a significant dent on the shoulder. One reason among several that I’m hesitant to switch to cans when I need reliable first shot consistency.

 

[Foster_65]

Yes but only on the can that I have on a short barrel 7prc using n570. None of my other cans on other cals have had an issue

 

[wind gypsy]

Yes i have, during a match. Fail to chamber because carbon was on the bolt face. Pretty inconvenient to carry muzzle down all the time to avoid it. Dont have any tricks other than what has been shared here.

 

[43.6N]

Happened to my NRL partner this last weekend.
We immediately swapped to my rifle.
After the stage, used a chamber flag and microfiber cloth the clean the chamber. Then ran a bore snake.

I wonder if having some type of muzzle device makes it worse. He was using a TBAC cone break.

 

[Formidilosus]

Much like cleaning barrels… 80,000 to 100,000 rounds a year, and a couple millions rounds total all suppressed- still waiting for the first issue.


Tight chambers and throats, minimally sized brass, bullets loaded into it close to the lands- these are what cause problems.

 

[justin davis]

Yes but only on the can that I have on a short barrel 7prc using n570. None of my other cans on other cals have had an issue

I’ve had it happen a few times. 6 creed and a 22 creed both with N555 powder.

I’m unfamiliar with this “clean” word you use.

Yea what a pain in the rear when it happens

 

[justin davis]

Much like cleaning barrels… 80,000 to 100,000 rounds a year, and a couple millions rounds total all suppressed- still waiting for the first issue.


Tight chambers and throats, minimally sized brass, bullets loaded into it close to the lands- these are what cause problems.

Yea I had it happen 3 or 4 times. Seems to happen after winter of coyote hunting.

The carbon has been on the shoulder area of the brass. I’ve been able to chamber a round every time but i have to force it pretty good.

I bump my brass back 2 thousands.

Maybe it’s the powder I’m using?

Just annoying that it happens.

 

[Formidilosus]

I bump my brass back 2 thousands.

I would say it’s likely this.

 

[Sundodger]

Related to what Form said about tight chambers, and throats, minimally sized brass, bullets loaded into it close to the lands...

Has anyone had this issue with factory ammo in SAMMI chambers?

 

[WoodlandCritter]

Am I the only one who has had a baffle strike from excessive carbon getting dislodged?

What do you mean by this? How does fouling inside your can cause a baffle strike?

 

[RockAndSage]

What do you mean by this? How does fouling inside your can cause a baffle strike?

Very well-used suppressor in full-auto testing, over tens of thousands of rounds. Was running short on time in one cycle and didn't want to overheat the can, and was cooling it off by putting it into a snowbank. Out of the blue rounds started keyholing - literal side silhouettes of the bullets, at 25yds. Part of the cap had been blown out, with baffle damage inside too. Best understanding is that the differential heating/cooling of the can and the fouling caused a big chunk to get dislodged and fall down into the bore channel. Very little of the fouling in a suppressor is actually carbon - it's largely micronized lead and copper, blast-welded against the wall of the can and each other. Lead and copper have very different melting points from steel. So, get all of it hot with full-auto mag dumps, then cool the steel of the suppressor off rapidly, and stuff can break loose from the wall. Haven't tried to replicate the problem, for obvious reasons, and not sure what would happen with different suppressor designs, but I don't take suppressors with extremely high round-counts, get them red hot, then rapidly quench them in snow anymore.

 

[solarshooter]

I bump my brass back 2 thousands.

I would say it’s likely this.

Yes, I used to aim for 0.002" shoulder bump as well and had issues, maybe 2-3 out of 100 cases hard to chamber. If you measure enough resized cases you'll start to see variation in the actual final size even though the die isn't moving, easily to the tune of 0.001-0.002". I think is is mostly due to differences in spring back of different pieces of brass. Now I aim for 0.004" bump and don't have any issues. And accuracy is not affected.

 

[Ucsdryder]

Yep, I’ve had it happen to me. It was a big enough flake that I couldn’t close the bolt on opening morning of elk season a few years back.

Now I clean my suppressors before the season and it’s been a nonissue.