300 Norma Mag best twist rate

Hootiewho

Sergeant
Full Member
Minuteman
May 12, 2006
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I’m wanting to pick up a 300 NM barrel for my AXMC. Will probably be shooting the Berger 215’s and maybe the 230’s. AI barrels are 10 twist, and I had looked at the Proof offering at 1:9.

What is the preferred twist rates for these projectile?
 
From Todd Hodnett - 1:8 will give you better performance in transsonic and subsonic while maintaining accuracy in supersonic

He told me that personally so I know its not internet folklore.
 
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Building a 32" 30 Sherman Magnum. Not quite a 300 Norma but close. Plan to run 220 LRHT around 3100-3200. Mines an 8 twist. I dont see a reason to run less. But I'm also at low elevation living in Boston. And it let's me run 221 solids. A 9 would be fine no doubt but rules out solids