What neck chamber size?

G

gt40

Guest
What is the inside neck chamber size for a no neck turn Lapua brass for 6mm Norma BR?

I just seated a 90 grain match Berger bullet into a new Lapua 6mm Norma BR case. Before I seated it I miked 5 necks of the new unfired brass and they all measured .268 inches then I miked the neck of the seated case and it measures .269 inches. I hope I read the 2 different mikes correctly.

What should the neck in the chamber measure?

gt40
 
Last edited by a moderator:
6br

G'day Gt40

My 6BR reamer is from PT&G and was a "No Turn" neck at 0.270. I'm using Lapua brass and loaded rounds neck measures 0.2685.
Most would consider this to be the minium clearance for neck dia.

Cheers
Leeroy
 
Neck Clearance

.270 would be my dead minimum, and with some flat base bullets with a substantial gas ring, that might be a tad tight.

.271 would error on the safe side.........jackie
 
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