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Will's penetration index ?

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06 February 2005, 05:19
ALF
Will's penetration index ?
W
06 February 2005, 12:50
Will
Alf,

It's not my PI but from Art Alpin's Any Shot You Want.

It is reportedly non-linear as 100 does not mean twice the penetration of a PI of 50. For solids it indicates the potential penetration, which generally I have found to be true, but every shot and every animal is different.

PI=(KE)(SD)/(100 A)

KE=bullet kinetic energy, ft-lb
SD=sectional density, lb/in^2
A=bullet x-sectional area, in^2

Ex., 400 gr. 416 at 2400 fps gives PI=124.2


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Will / Once you've been amongst them, there is no such thing as too much gun.
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06 February 2005, 20:05
ALF
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