imported post
I have made it before and in most cases it will do more harm then good.
If you do not make sure the gel is harden long enough, too long or not mixed correctly your results will vary to both extremes. You have very little working time with the gel as well. I have had gels blocks stop rounds completely or not even slow them down.
Below is the FBI standard for their testing
The test media used by the FBI to simulate living tissue is 10% Ballistic Gelatin (Kind & Knox 250-A), mixed by weight (i.e., one pound of gelatin to 9 pounds of water). The gelatin is stored at 4° Centigrade (39.2° Fahrenheit) and shot within 20 minutes of being removed from the refrigerator. The temperature of the gelatin is critical, because penetration changes significantly with temperature. This specific gelatin mix was determined and calibrated by the U.S. Army Wound Ballistics Research Laboratory, Presidio of San Francisco, to produce the same penetration results as that obtained in actual living tissue. The 10 % gelatin has been correlated against the actual results of over 200 shooting incidents. Each gelatin block is calibrated before use to insure its composition is within defined parameters. Copies of the test protocol are available upon request for those interested in duplication the testing or reviewing the procedures in greater detail.
http://greent.com/40Page/general/fbitest.htm
