Thread: Odd 300 blackout loading

What's the head stamp on the case that has flared out when the projectile was seated?
Is it the same as the others?
I am picking that the wall thickness of that case is too thick. There are quite a few case brands that have too thick a brass around the neck to be used as 300 blackout brass.
A Sheridan case gauge will pick this issue up once a projectile is seated. Other gauges wont.
Don't chamber it as it will get stuck in your chamber.

Sheridan Engineering - Ammunition Gauges