Lapua 6BR brass dimension

[swadiver]

anyone know the head space measurement of current, new, un-fired Lapua 6BR brass measured with the Hornady head space gauge?

 

[JAM-MAN]

Wouldn't this be chamber specific?

 

[swadiver]

i am talking brand new out of the box brass, unfired

 

[JAM-MAN]

Compared with CIP standard chamber?


"Headspace is defined as the distance from the bolt or breech face to a measuring point within the chamber forward of the breech. With rimmed cartridges, such as .22 long rifle, 30-30 or .357 Magnum, the measurement is to the front of the rim cut. Straight- walled rimless cartridges, such as .30 Carbine, 9mm Luger or .45 ACP, are measured to the mouth of the chamber. Rimless bottleneck rounds, like .223 or 30-06, are measured to a point on the shoulder at a certain specified diameter. Belted magnums, .300 Win. Mag., or .375 H&H, are measured to the front of the belt cut, essentially like a rimmed case."

Do you want the length to the datum point on the Case?

 

[swadiver]

i guess that is the number i am looking for.

 

[JAM-MAN]

My bad. CIP doesn't seem to use datum on shoulder. Look at 6mm BR site and 6mm BR case diagram. I just got a blue box and can measure some dimensions. Don't have anything to measure, although Whidden sends a datum tool with the 6mm BR die, I suppose from the SAAMI Rem 6MM BR.So I could give you that and COAL.

 

[JAM-MAN]

My bad. CIP doesn't seem to use datum on shoulder. Look at 6mm BR site and 6mm BR case diagram. I just got a blue box and can measure some dimensions. Don't have anything to measure, although Whidden sends a datum tool with the 6mm BR die, I suppose from the SAAMI Rem 6MM BR.So I could give you that and COAL.

Dang see here:http://www.6mmbr.com/6brfaq.html

The case shoulder datum is 8.88mm. So I have the datum gauge, is this what you need? For your chamber, you'll need some fired cases of course.

 

[swadiver]

i was just looking for someone to use their Hornady tool to measure a new, unfired case in the same way one would measure the case after it is was fired to get brass headspace

thanks

 

[Hntndad]

The hornady gauge is a comparator and most likely will vary slightly in dimensions from one to the next. Someone else's measurement will be different from yours.

 

[swadiver]

i understand still would like the measurement

thanks

 

[Sheldon N]

I get 1.139-1.140 with the .375 comparator insert and 1.160-1.161 with the .350 insert for unfired Lapua Blue box 6BR brass.

 

[swadiver]

Thank you, Sheldon. much appreciated

 

[Dimwit Flathead]

What difference does it make if you are going to fire form it anyway?