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round for 1in14 twist

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MY .22-250 1 in 14" shoots 60 grain flatbase spitzers very well, thank you. It also shoots the 70 grain Speer semipointed well enough for its intended purpose.

There are two common misconceptions about rifling twist current on the Net.
One is that rifling twist - bullet matchups are very selective and restrictive. Actually they are very flexible as long as the bullet is stabilized at all.
The other is that the Greenhill formula applies closely to smallbore spitzers.
 
I have a 222 with a 1in14 twist.It is unerving the accuracy from Hornady's 55 grain SP. Byron
 
Fella's;

Keep in mind that the ability to stabilize a bullet for a given caliber & twist is not only dependant upon the bullet weight, but also the velocity of the bullet.

900F
 
I have always heard its more dependent on bullet LENGTH than weight.
Click to expand...

That's correct. The Greenhill forumla is Twist = (bullet diameter^2 X 150)/bullet length. While this is really just an emperical rule-of-thumb, it's right for most small arms calibers, over most velocities.

In this case, we have 14=(.224^2 X 150)/bullet length. Or 14 = 7.5264/bullet length. Bullet length =7.5264/14.

So bullet length could run up to a half inch or so.
 
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