Match grade barrel fouling after 40rds?

Over the years, I managed to live in Boardman, Baker City, Medford, Forest Grove, Warrenton, and Halfway. Some places are a bit bluer-haired than others. Some places strike a pretty good balance and some need to advance into the modern age. There’s a little something for everyone.
I used to live near Forest Grove, its gone downhill in recent years with the homeless. Now im between Scappoose and Vernonia. Scappoose isnt what it used to be either, the Portlanders decided they dont like the policies they voted for so they have been pushing out this way.
 
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It is possible your chamber neck dia is tight and the case neck clearance is minimal, causing the carbon build up to decrease the clearance even more. Can you drop/slide a bullet into a fired case neck? If you can, that isn't the problem. If you can't get a bullet in the fired case mouth, then there is your answer.
 

It is possible your chamber neck dia is tight and the case neck clearance is minimal, causing the carbon build up to decrease the clearance even more. Can you drop/slide a bullet into a fired case neck? If you can, that isn't the problem. If you can't get a bullet in the fired case mouth, then there is your answer.
This finally dawned on me last night too. I had a tight necked BR that was similar one time. @AustinCar32 what is your OD of a loaded round case neck and another of your fire case neck?
 
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On all peices of fired brass that have no pressure signs, the bullet drops right in like normal. All peices of brass showing even minor pressure signs, i have to push the bullet in and the bullet will stay in place even if i turn the brass upside down and shake it.

Got the borescope, heres what i see. First picture is the shoulder area inside the bore, second pic is just before the rifling, i think may be a carbon ring?
 

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Pic 1: So you got fire cracking, which means there’s been substantial heat with history of firing. This is not something in which to be alarmed with a high volume comp rifle, but a hunting rifle it’s insane. Don’t ask a tool to do two things equally as good.
Pic 2: Yup, carbon ring.
 
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Pic 1: So you got fire cracking, which means there’s been substantial heat with history of firing. This is not something in which to be alarmed with a high volume comp rifle, but a hunting rifle it’s insane. Don’t ask a tool to do two things equally as good.
Pic 2: Yup, carbon ring.
The fire cracking probly wouldnt cause my problems, right? And im assuming the carbon ring is most likely my problem this whole time?
 
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The fire cracking probly wouldnt cause my problems, right? And im assuming the carbon ring is most likely my problem this whole time?
Considering the case neck clearance is changing at a rapid pace, as evidenced by the difference in the case necks bullet test, just focus on keeping the carbon ring in check. Your case neck clearance has got to be too little. Neck turning the brass is the only way to increase that clearance without rechambering with a reamer with larger neck diameter.
 
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On all peices of fired brass that have no pressure signs, the bullet drops right in like normal. All peices of brass showing even minor pressure signs, i have to push the bullet in and the bullet will stay in place even if i turn the brass upside down and shake it.

Got the borescope, heres what i see. First picture is the shoulder area inside the bore, second pic is just before the rifling, i think may be a carbon ring?
If I’m looking at pic #2 correctly, that seems like one heck of a carbon ring? I’m no expert, but my carbon rings have been waaaay more wimpy after way way more rounds.
 
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Maybe I'm a bit dense, but I do not see any fire-cracking in pic 1. Which is good, because fire-cracking should not be present at the shoulder area.

What I do see in pic 1 is chatter and tool marks. Whoever chambered that rifle should be ashamed of himself.View attachment 8654731
Yeah, it’s like looking into an unfinished Death Star or something
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That’s the problem with bore scopes. Everyone sees barrels as living in a binary state. The are shiny and perfectly machined, or the are rotted/pitted/cracked which means bad. There are states in between that still allow the barrel to still shoot reasonably accurately. What they don’t show are out of bounds chambers/throats and ammo deficiencies.
 
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Blue arrow is where the area just prior to the chamber wall where the carbon ring forms. This is a clean barrel, of course with Thorroclean, and no ring is visible. The yellow arrow is where the lands begin, thus muzzle direction.
IMG_0016.JPG

Directions flipped, but you see where a case its in the chamber just prior to chamber wall.
IMG_0018.JPG

Then if the ugly black ring you see below is formed in that area where the case neck sits, it decreases the clearance, because the case neck would sit on top of the carbon ring crud.
IMG_0022.JPG
 
Blue arrow is where the area just prior to the chamber wall where the carbon ring forms. This is a clean barrel, of course with Thorroclean, and no ring is visible. The yellow arrow is where the lands begin, thus muzzle direction.
View attachment 8655418
Directions flipped, but you see where a case its in the chamber just prior to chamber wall.
View attachment 8655421
Then if the ugly black ring you see below is formed in that area where the case neck sits, it decreases the clearance, because the case neck would sit on top of the carbon ring crud.
View attachment 8655423
Pretty thin skin dude, didn’t even have to work very hard to get you to freak out.🤣🤣🤣
 
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