Seating depth mystery

[Indian7953]

My 7mm Rem mag's seating depth seams to have changed. My last reloads, 143 ELDX, every thing exactly measures the same, but has resistance closing the bolt and almost impossible to remove the unfired cartridge. However the fired case ejects easily and re-chambers with no force. My seating depth @ ojive is still the same, same box of bullets, etc. What is going on? Here is a picture of my loaded cartridge, the fine ring is made by my ogive gauge, the wide rough ring is behind the lands. What is causing the scraping?

 

[Nimrodmar10]

Could it be a carbon ring forming in the forcing cone

 

[Mikecr]

This is where a borescope helps. There may be a carbon ring built up in the freebore.
Has there been no change in bullets or case sizing?

 

[Mikecr]

This is where a borescope helps. There may be a carbon ring built up in the freebore.
Has there been no change in bullets or case sizing?

 

[Indian7953]

This is where a borescope helps. There may be a carbon ring built up in the freebore.
Has there been no change in bullets or case sizing?

Nichanged

 

[Indian7953]

Nichanged

No changes

 

[Indian7953]

My 7mm Rem mag's seating depth seams to have changed. My last reloads, 143 ELDX, every thing exactly measures the same, but has resistance closing the bolt and almost impossible to remove the unfired cartridge. However the fired case ejects easily and re-chambers with no force. My seating depth @ ojive is still the same, same box of bullets, etc. What is going on? Here is a picture of my loaded cartridge, the fine ring is made by my ogive gauge, the wide rough ring is behind the lands. What is causing the scraping?

Well, I got my borescope today and took a look, I was shocked. It is not a carbon ring but a copper ring. The only thing I can think causes it is rough machine work between the case neck and the rifling. Maybe that area is undersized as well.

 

[Indian7953]

 

[Mikecr]

Wow. Never seen that

 

[den]

7mm 143 eldx ? you meant 7mm 150 or 162 eldx right ?

 

[Indian7953]

7mm 143 eldx ? you meant 7mm 150 or 162 eldx right ?

Yes 162LDX

 

[Indian7953]

Here is the route that I took to repair the stuck cartridge problem, instead of removing my scope, sending in my rifle and breaking in a new barrel. I drilled and tapped a Re-sized case, made a dummy round with the bullet seated at the lands. Then I threaded in a cleaning rod into the threaded primer pocket put grease on the case body and lapping compound on the bullet, chucked in my drill and lapped in the area with different grits, and polishing compound. Photos are before during and after.

 

[Indian7953]

View attachment 160425 View attachment 160426 View attachment 160427 Here is the route that I took to repair the stuck cartridge problem, instead of removing my scope, sending in my rifle and breaking in a new barrel. I drilled and tapped a Re-sized case, made a dummy round with the bullet seated at the lands. Then I threaded in a cleaning rod into the threaded primer pocket put grease on the case body and lapping compound on the bullet, chucked in my drill and lapped in the area with different grits, and polishing compound. Photos are before during and after.