Seating depth mystery

[Indian7953]

Another thought. I have these little plugs that Sinclair sells for checking chamber length. You may look into that. I've found more times than not my chamber is shorter or longer than "I thought"

Thanks

 

[Indian7953]

Well I got my borescope today and took a look, I was shocked, no carbon ring but a copper one. It looks like the area between the neck and the rifling is very rough and maybe undersized, causing the copper following.

 

[shinbone]

Holy cow, that's a lot of copper!

 

[lamiglas]

Wow!! That is alot of copper. However, I am anxious to see what you find underneath the copper. If a carbon ring were present this could be the reason copper was collecting there.

 

[squeeeeze]

Yikes!

 

[sturner]

I'm no expert looking though a bore scope but that looks like a lot
Why so much after 90 rounds

 

[Indian7953]

I'm no expert looking though a bore scope but that looks like a lot
Why so much after 90 rounds

I am guessing that the area was not machined correctly.

 

[SealT5]

That chamber is very rough. Is this a factory or custom rifle? With a chamber like that I would think this problem will just progress.

Joe S

 

[Indian7953]

I am guessing that the area was not machined correctly.

You can see a groove right at the beginning of the riffling, none of my other guns have that ring, so I'm assuming that the area between the case neck and the rifling it's not machined down as far as it should've been.

 

[Indian7953]

That chamber is very rough. Is this a factory or custom rifle? With a chamber like that I would think this problem will just progress.

Joe S

Christensen Arms Ridgeline. I'm going to call them tomorrow and share the photos with them to see what they suggest.

 

[Rhovee]

Freebore diameter is usually the first to get worn down on a reamer. Looks pretty tight. Clean it all off. Then see if it marks a bullet when chambered and removed

 

[Indian7953]

Wow!! That is alot of copper. However, I am anxious to see what you find underneath the copper. If a carbon ring were present this could be the reason copper was collecting there.

When I was setting up my seating depth I noticed a little bit of stuffing in that area when it was brand new

 

[Indian7953]

When I was setting up my seating depth I noticed a little bit of stuffing in that area when it was brand new

Make that "scuffing"

 

[SealT5]

I agree with you. I would contact the manufacturer like you said and question the chamber. I've read good reviews about christenson arms customer service. Sucks to have this happen though. Good luck

You can see a groove right at the beginning of the riffling, none of my other guns have that ring, so I'm assuming that the area between the case neck and the rifling it's not machined down as far as it should've been.