Here are some links to gelatin testing:
"Official" process and details:
http://www.firearmstactical.com/tact...2/article1.htm
Reference to Vyse gelatin, a cheaper/equivalent alternative to Kind & Knox:
http://www.firearmstactical.com/tact...umber2/toc.htm
A citizen gelatin tester's notes and results:
http://www.goldenloki.com/ammo/gel/tests.htm