JBM has online calculator. Does anyone know if the higher the number is better or is 2-3 the optimal range?
Thanks,
Stability
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T-Rex
- Silent But Deadly
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- Location: CT - The AntiConstitution State
Re: Stability
You want a value of 1.5, or higher, when applying the Miller Formula/Twist Rule.
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Re: Stability
Well, the JBM number is between 2 and 3 for my loads with Red Dot and Trail Boss (647 gr projectile), I am getting some key holes at 50 plus yards. A thin sheet of paper was the target.
I should have known that 647 gr 50 BMG is too large for stable subsonic use.
I should have known that 647 gr 50 BMG is too large for stable subsonic use.