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Old January 26, 2013, 08:18 PM   #26
jmortimer
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Join Date: January 24, 2010
Location: South West Riverside County California
Posts: 2,763
"It means that 10% ballistic gelatin ALREADY FIGURES IN the density of bone, along with all other tissue types in the body."

Brass Fetcher or Mr. Irwin and a plastic garbage can full of water. I'll stick with Brass Fetcher. The correlation is approximately 2" of water equals 1" of 10% ballistic gelatin which does not have anything to do with bone simulation, but soft tissue. So, no you are wrong. This is from the link above, and makes sense, where you are flat out wrong:

"Ballistic gelatin is an industry-standard medium used for evaluating the terminal performance of hunting and self-defense ammunition. Gelatin blocks offer many advantages in this role – it is a highly viscous liquid, offering a density close to that of human body fluids and the low-velocity characteristics of muscle tissue. It is a highly consistent material, which makes it very useful for making accurate measurements of damage done to the gelatin by a bullet penetrating soft tissue only.
The critical areas of the body are generally protected in some manner by the presence of bone immediately behind the skin. The large percentage of the vital areas of the chest that are protected by the rib cage and sternum make it desirable to simulate bone and then the soft tissue behind the bone. A priority of this report was in choosing a caliber and ammunition that was relevant to both civilian law enforcement and
civilian gun owners. We evaluated several popular .38 Special JHPs from a common CCW firearm – a Smith and Wesson 642 with 1 7/8” barrel length.
Bone simulation was effected by placing a bone simulant plate, produced by Synbone AG of Switzerland, in front of blocks of 10% ballistic gelatin (Figure 1.) Tested plates were 6mm ( ¼” ) thick and covered by a rubberized ‘skin’ layer. Product number of these plates is PR0114.G. Density for the tested
samples came out to be 816 kg/m 3 and the failure mode for these was ‘brittle’ failure, similar to bone.

BTW, from Wikipedia:

Ballistic gelatin is a testing medium scientifically correlated to swine muscle tissue (which in turn is comparable to human muscle tissue), in which the effects of bullet wounds can be simulated. It was developed and improved by Martin Fackler and others in the field of wound ballistics.[1][2][3] Ballistic gelatin is a solution of gelatin powder in water. Ballistic gelatin closely simulates the density and viscosity of human and animal muscle tissue, and is used as a standardized medium for testing the terminal performance of firearms ammunition. While ballistic gelatin does not model the structure of the body, including skin and bones, it works fairly well as an approximation of tissue and provides similar performance for most ballistics testing. Ballistic gelatin is used rather than actual muscle tissue due to the ability to carefully control the properties of the gelatin, which allows consistent and reliable comparison of terminal ballistics.
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