Thread: Twist rate vs velocity vs bc

Originally Posted by Kiwi Greg

In Bryan Litzs latest book he says the difference in velocity from slow to fast twist is typically less than the usual ES so basically no difference.

Also a faster twist on a bullet gives it a slightly higher BC than a slower twist, so that would probably cancel out or over ride any loss of velocity at distance.

It is possible that over stabilised projectiles can nose up causing a loss of BC at extreme range.

A client has tested my .375 425 CEB projectiles in my old 7.25 exit 375 DCM at 4000m

They would have been way subsonic but they were still stable & nose up even with the 20-25 degree angle of decline when they hit the target

Even though they were nose up they still went transonic fine & the trajectory was repeatable.

I'm really looking forward to testing of the 400 & 425s in my 40" 1-9 twist 375 DCM & my 452s in the 7.25 exit twist 375 DCM, should be interesting.

It doesn't really matter what is "supposed" to happen in theory, what matters is what happens in practice, like the 208s in the 14 twist in a previous post

Cool! so in the above example bullets were seen to be staying on the line of bore presumably by shooting at cardboard/paper?