Have you seen this before

[762willdo]

.308 Lapua Palma brass with a raised lip around the flash hole, out of 100 case 2 had this……

 

[Kracken McGraw]

We’re they hot loads ? I didn’t know if that was a ejector mark on the bottom case.

 

[762willdo]

All loads the same

 

[Old Navy]

.308 Lapua Palma brass with a raised lip around the flash hole, out of 100 case 2 had this……

Your de-capping pin is to big.

 

[Florida Wally]

Your de-capping pin is to big.

I agree. You can check by putting the pin in the hole from the case head side. Shouldn’t be any contact with the flash hole. You can chuck the decapping pin in a hand drill and use 300 grit sandpaper to reduce the diameter.

 

[762willdo]

These are srp Palma brass, pin is fine works in the other 98 case…that was my thought to

 

[ClayM]

Possibly...de-cap rod end hitting inside flash hole due to brass thickness variation???...

 

[rwj]

Possibly...de-cap rod end hitting inside flash hole due to brass thickness variation???...

Easy to verify by looking for an indentation on the other side of the flash hole…

 

[mgunderson]

Proceed with caution. I bet whatever caused the issue is going to happen again. Looks like the brass flowed. Pin is the most logical. I suggest measuring the flash hole on the bunch and see if those are on the small side.

How many times fired? Wet tumble? What made you look?

 

[coldboreshot]

.308 Lapua Palma brass with a raised lip around the flash hole, out of 100 case 2 had this……

When you say 2 out of 100, they came from factory this way? I'm thinking, if you had an oversized decapping pin, it would have affected other cases in that run as well. If they arrived that way, discard them. Propably mfg mishap.

 

[762willdo]

They are once fired didn’t catch it on first priming, I’ve shot a lot of Lapua 308 never expected it……

 

[6.5 forever]

.308 Lapua Palma brass with a raised lip around the flash hole, out of 100 case 2 had this……

One thing is for sure. That is a hot load.

 

[M-61]

It is a hot load for the rifle it was fired in.
Did you do ‘anything’ to the flash hole?

 

[WVRJ]

Lapua makes the flash hole in their small primer 308 brass .059.Most decapping pins are .065.They claim that the smaller hole makes a longer tongue of flame which helps with consistent ignition.Turn the pin in your die down to .057 and you'll be ok.

 

[markm87]

Spin off the extra material with a drill bit and drive on!

 

[762willdo]

No all pockets are tight all loads individually weighed not ”hot” but not mild either
45grains of Varget and 169 smk

 

[jonbearman]

Its the way they punch out the primer pockets. I have seen hundreds like it.

 

[Dusty Stevens]

Its your decapping pin or their punch. I wish you coulda seen it before you fired them to know for sure.
Judging by that ejector mark thats a hot potato. Dont think that did your mushroom though. Its getting hotter outside so watch that load

 

[SKWERLZ]

Its your decapping pin or their punch. I wish you coulda seen it before you fired them to know for sure.
Judging by that ejector mark thats a hot potato. Dont think that did your mushroom though. Its getting hotter outside so watch that load

It may be even spicier now that it’s conformed to the chamber a bit.

I’ve seen that in cheaper brass from the punching primer pocket processing.

 

[D-4297]

It appears to be "Material Drag" from the Die punch . As a Die punch begins to wear at the edges , it will push material down , instead of cutting through cleanly , and the Guide-hole in the base of the Stamping Die begins to wear , similar to a F/P Bushing . The end result is what you're seeing in the photos . Almost make a wager those cases had that same "lip" before they were ever fired . Lapua does make mistakes , but not very often . That's why there were only two out of 100 . Guessing the operator caught it , pulled the stamping Die , and had it sharpened , or there would have been more got out in the Lot .