Twist rate conflicted

[MikeinGa]

Here's the formula I've always used:

Bullet Length/Caliber Diameter= Nominal Caliber
150/Nominal Caliber= X2
X2 x Caliber Diameter= Twist

Lapua 123 = 1.30"

1.30/.264=4.924
150/4.924=30.463
30.463x.264=8.042 Twist rate

-Will-

That look right. My 123 A-max is: 1 in 8.7 that's using my Lee Shooters program and they call it minimum twist. I checked my 24 inch barrel and it's 1 in 8.5 twist. That shoots a 1/2 MOA.

Mike