View Single Post
Old July 18, 2013, 11:38 PM   #1
engineglue
Junior Member
 
Join Date: July 18, 2013
Posts: 10
Expansion vs Penetration

Accurately placed expansion bullets plus good penetration without over penetration would be ideal. I'm sure that's obvious but a difficult balance. In practical use, this is what usually happens;

(I'll define "vital" as a large artery, heart, spine or brain.)

1. The bullet expands and comes in contact with a vital.
2. The bullet expands and doesn't penetrate deep enough to come in contact with a vital.
3. The bullet doesn't expand and misses a vital due to the bullets smaller diameter.
4. The bullet doesn't expand and hits a vital due to accurate shot placement.
5. The bullet over penetrates and potentially causes collateral damage.

To consistently achieve the above five possible outcomes, we would need the following:

1. For the first case; A mid to high powered cartridge (1000fps+), with excellent expansion design.
2. For the second case; A low to mid powered cartridge (1000fps-), with excellent expansion design.
3. For the third case; A mid powered cartridge (1000fps).
4. For the fourth case; The same as the third case.
5. For the fifth case; A mid to high powered cartridge (1000fps+).

A mid powered hollow point could teeter between no expansion and under-penetration.

A mid powered full metal jacket could teeter between missed vitals and over-penetration.

It seems that a non-expanding bullet in a high powered cartridge would be the most reliable. Relying only on the shooters ability.

Note:
1. FPS alone does not tell you how much damage will be caused but it can tell you if the bullet will expand.
2. A 124 grain FMJ 9mm fired from a barrel which delivers 1,000+ fps should provide adequate penetration to hit a vital with the chance of over penetration.
engineglue is offline  
 
Page generated in 0.04915 seconds with 7 queries