6.5x284 Lapua w/140 Berger neck Diameter?

[AndyW]

New blue box Lapua brass, can anyone let me know the neck diameter with a 140 Berger seated? I have to order a couple neck bushings.Thanks!

 

[fivering]

The neck thickness may vary from brass lot to lot.
Why don't you turn your necks slightly (about 75%), to establish a consistent neck thickness, seat a few bullets, mike the neck OD with the seated bullets, subtract the amount of neck tension you want,( usually 2-3 thousandths) and order what you need.

 

[AndyW]

The neck thickness may vary from brass lot to lot.
Why don't you turn your necks slightly (about 75%), to establish a consistent neck thickness, seat a few bullets, mike the neck OD with the seated bullets, subtract the amount of neck tension you want,( usually 2-3 thousandths) and order what you need.

I am trying to establish a baseline before I order, no dies or bushings at this point. I am defiantely not turning necks, been there done that.

 

[tclaunch]

The "Blue Box" 6.5x284 brass runs from .014" to .015+ neck thickness from a sample of a few rounds out of a box at work. I took my Mitituyo tubing mike with me for this very dimension check. I`d figure a .293" loaded round. I`d suggest a .296 no turn chamber with a .291 bushing. This from a single sampling from 1 box of brass.