Need Neck Dimension for .300 Norma using Lapua brass

[Jarhead6870]

Now that Lapua's .300 Norma brass has hit the shores and is available, I need an outside neck measurement using Berger Hybrids in the new brass. I'd appreciate any input so I can make sure that the reamer used will work for a "no-turned" neck and I can order bushings for the sizing die. For those with experience with this round, how much over case/bullet measurement do you recommend for the neck, again this is for a "no-turn" neck.

Thanks in advance...Semper Fi

 

[LA50SHOOTER]

I'd run 0.004 or slightly more neck clearance. (For a No-Turn set-up)
The 2 Lots of Lapua 300 Norma Mag. Brass I've received ran at 0.0142 to 0.0152 in thickness. - Based on this, 0.0152 x 2 = 0.0304
Bullet dia. (approx. 0.3083) + Neck thickness (0.0304) = 0.3387 - Then I'd add 0.0040 minimum - So my answer is to have a Finisher Chamber Reamer with a 0.3430 neck provided, 0.3420 would be the minimum.
- Also the 2 boxes of Berger Ammo that I've purchased (Uses Lapua Brass & Berger Bullets) measured around 0.338* to 0.339* at the neck.

Regards, - Ron -

 

[Jarhead6870]

Thanks Ron. I'd order my own reamer if the dimensions were too far under the reamers with the .343 necks but they should be GTG for the Lapua brass.