Bolt damage to primer cup?

[matts]

Ok i was looking at some small round markings, i totally overlooked the crimps as normal sorry

 

[DirectDrive]

Ok i was looking at some small round markings, i totally overlooked the crimps as normal sorry

The dots are SCAMP marks which have to do with the different production steps.
The circle with cross is the NATO mark.
LC is Lake City ammunition plant Independence, Missouri.
Then the year produced mark.
Your pic of the 4 sided crimp really shows how the brass has been displaced toward the primer.

Over-pressure signs include :
Flattened primer.
Cratered primer strike (over-pressure behind the primer cup flows cup material into the space between the firing pin and firing pin hole)
Ejector mark on case head (over-pressure brass flows into the ejector bore leaving a mark on the case head)

 

[Dozer99]

Good brass. Makes good reloads.

 

[Steel Head]

Good brass. Makes good reloads.

This
Lake city tends to be excellent and durable brass.

Swage or cut out the displaced material.

 

[Spitpatch]

The dots are SCAMP marks which have to do with the different production steps.
The circle with cross is the NATO mark.
LC is Lake City ammunition plant Independence, Missouri.
Then the year produced mark.
Your pic of the 4 sided crimp really shows how the brass has been displaced toward the primer.

Over-pressure signs include :
Flattened primer.
Cratered primer strike (over-pressure behind the primer cup flows cup material into the space between the firing pin and firing pin hole)
Ejector mark on case head (over-pressure brass flows into the ejector bore leaving a mark on the case head)

I would respectfully modify this excellent and comprehensive reply only in this fashion:

"Over pressure signs MAY include:"

Since all these signs (save perhaps the ejector mark) can and do commonly occur without over-pressure.

 

[msgriff]

Heavier brass/slightly less case capacity?

Yes, NATO is thicker mostly in the web and head. Some limited data from another site on google drive :
case volume

 

[Mikej]

Yes, NATO is thicker mostly in the web and head. Some limited data from another site on google drive :
case volume

That's what I figured from research on 7.62 NATO VS .308 brass. It's good thing to point out to those just getting into loading. Both calibers.