Odd Lapua 6BR primer pocket

[VA_XTC_Shooter]

I was priming brass and came across one that just would not seat. Punched the new primer out and thought maybe dirt in the pocket I missed. So I went to clean the pocket and realize the pocket depth is extremely shallow. 0.094” vs 0.120”
When I look inside the brass I see a distinct ring the size of the primer pocket. Almost looks like the primer pocket was installed separately.
Any ideas what caused this? From the factory? I had already fired this brass and didn’t notice a high primer before. First photo is the bad brass, 2nd is regular in spec brass.

 

[djporter]

My guess would be that your de-prime rod is set to long.

 

[VA_XTC_Shooter]

Using a Lee depriming die. I’ll double check, but would think if that was the case, it would’ve happened to more than just this one piece?

 

[rwj]

It might be interesting to contact Lapua...

 

[Lefty Trigger]

Measure the case volume between that case and another. My guess is that the "odd" case will have less volume because the base is thicker, might explain the the odd punch mark from manufacturing?

 

[rogn]

Try reinstalling a spent primer and see it with necessary force that iteats to fuul depth. Gotta wonder if the case has a primer pocket "slug" that is able to move fore and aft in the case head. ?

 

[MagnumManiac]

I would take 2 measurements on that case using a vernier, firstly the depth from case mouth to web then the case mouth to bench, then compare with a case that is known to be correct.
This should give you an answer.

Cheers.

 

[msalm]

I would just cut the darned thing in half lengthwise and file it clean and get a good look at what’s going on. You’re not likely going to use it, so learn what you can.

 

[piie]

Using a Lee depriming die. I’ll double check, but would think if that was the case, it would’ve happened to more than just this one piece?

give us a photo of the primer pocket too please