Gungadoug,

Thanks for checking. Your math looks good. Appears to be a situation where it is like trying to measure the speed of light with a wristwatch, yardstick and a flashlight...

I was interested because, at least the early Paradox chokes are reported to be 1 in 36". Most of the modern rifled 12's sabot guns are 1 in 34" to 36" too. I am wondering what twist it takes to stabilize a Fosbery slug.

Thanks again for your efforts.