6BR headspace datum diameter?

[broncman]

Can anyone tell me the datum diameter the 6BR Norma headspace is measured from? Searched but coming up empty...

 

[CatShooter]

Can anyone tell me the datum diameter the 6BR Norma headspace is measured from? Searched but coming up empty...

The BR family of cartridges has not been accepted by SAAMI (and never will be), so there is no datum line established.

None of the C.I.P. diagrams show a line (I don't know if C.I.P. uses datum lines).

 

[expiper]

bronc,,,,this should answer your questions,,,Roger

 

[22BRGUY]

+1 expiper....I use the .350 Hornady datum measuring tool.

 

[broncman]

Thanks Xpiper! Xactly what I needed. Now to go make one on the lathe..