Ultra Mag Brass

[Edd]

If any of you guys measure the base diameter of your new 300 or 7mm ultra mag brass, I'd like to know what sizes you are finding. I found one 3 year old thread where someone had measured .543". Is that consistent with everyone else's measurements?

 

[cbryant]

i measured a 7 rum at .544 at the base and the headstamp is .526

 

[300 ultra]

.547 on Nosler brass