Sam,
My thought was to fire a "typical" self-defense round maybe 9 x 19mm JHP because it's medium sized and cheap
through some bone, possibly sheep or goat sternum and/or skull may be close to human in thickness and density. Then use the same ammo in the same gun and shoot it through various other materials. Compare the results of the bone shots to the results of the other materials. The material that has the closest result to the real bone would be the winner -- as long as it was very close.
--------------------------
We all know that shots on humans have many variables and they all can't be simulated. That is not my intention. I know there may be other objects in the way (arms, hands, walls, etc.) I know the clothing may vary. I know the bullet may or may not hit bone, and may hit at various angles. I know people are different sizes. I know some people have thicker skin, stronger muscle, smaller or larger hearts and lungs, and smarter and dumber brains
, etc.
As I stated, I want to simulate a frontal COM and head shot on a human under "average" circumstances since this is "normally" what we feel is the best bet for a stop. For that reason it is what many or even most of us consistently practice.
Most tests to date have not even considered bone penetration, which seems rather odd to me. Most tests may have simulated a leg, arm, or gut shot, but we're aiming at the heart or the head!
I just wonder what will happen with various ammo fired through an average barrel (maybe 3.5" or 4") and if I'm really good (or lucky), and the shot is perfect, and the bullet is heading straight for the heart or brain...
Is it 'probable' that it will penetrate far enough? Is it 'probable' that it will expand or fragment when it's supposed to? Is it 'probable" that it won't over-penetrate by too much? And what ammo has the best probability in all this?
That means for a perfect COM shot the projectile must penetrate layers of clothing, skin, muscle, bone, then expand in the lungs and heart, and finally hit bone again. Those materials in that order. (The head shot is similar but with no clothing and a shorter distance during expansion.)
-------------------------------
I agree that the temperature of the gel must be consistently controlled during testing.
=================================================
ibmii,
Fired clay may work well.
--------------------------
Your "tube test" sounds pretty good too.
---------------------------
For the COM test setup I was thinking something like this may work (the head test setup would be similar):
A box with thick plexi or bullet-resistant glass bottom, sides, and top - no front or back. At the front and back there would be slots to slip the bone material into since it will have to be replaced from time to time. The block of gel would fit in between the two pieces of bone material. This would allow viewing and even possibly photographing the shots and results from top, bottom and sides. Also the containment of the gel would be more like the containment of brain heart, and lungs in the body within ribs and skull. The clothing fabric would be positioned over the front and the back. Situated a few feet behind this setup would be an interior wall arrangement (wallboard and 2 x 4's) to simulate the results of over-penetration in a home defense situation.
=================================================
Cesiumsponge,
Yes, the FBI formulation was calibrated, but it was calibrated to represent human
muscle not
soft internal organs. I believe a new formulation may be needed to more closely represent lung, heart, and brain for frontal COM and head shot simulations. Maybe I'm wrong in this because the heart is a pretty tough muscle. This is all very preliminary and the gel formula would definitely have to be worked on.
=================================================
Thank you all for your input so far!!!