View Full Version : Bullet Stabilization - Twist Rate & Bullet Size

02-28-2007, 8:27 AM
I know where to find the general guidelines on the appropriate bullet weight for a particular caliber and barrel length. However, how does a person know whether the particular combination you're using is actually properly stabilizing the bullet?

In other words, what are the symptoms of a bullet not being stabilized properly...hitting the paper not straight on thus leaving a strange hole, simply a reduction in accuracy?


02-28-2007, 9:19 AM
A quick Google for the Greenhill formula should give you a quick breakdown of how twist rates are calculated. As to symptoms of incorrect twist rates, inaccuracy, keyholing and such can be (though not always) signs of incorrect twist.

02-28-2007, 1:29 PM
Take a look at some of the pics here (heck read the whole thing too).

02-28-2007, 1:39 PM
One of he main things I was told to look for is keyholeing. If the holes in your target are not circles the bullets were a bit unstable.

02-28-2007, 1:47 PM
Great stuff. Thank you very much.