Quote Originally Posted by Bullitt 454 View Post
How do you figure the SD of a bullet that comes apart?
It can be done as soon as you know the dimensions and materials of the fragments.

There is an alternative path based on gel and wet-newsprint tests. You will see in the references to the Ideal Bullet Weight paper that an extensive set of tests support the conclusion that penetration in game is largely independent of caliber and impact velocity when the bullet impacts within its design envelope (usually 2,000 to 3,000 fps).