Ballistic gelatin is a quality control tool you can bet your life on. It’s composed of water and gelatin powder, and should be mixed in specific ratios, using well-vetted methods. Ballistic gelatin blocks have been used for a half century, allowing practical measurement of bullet expansion and penetration characteristics in a material reliably mimicking living tissue.
Sept/Oct 1979 - American Handgunner
10mm Ballistic Gel Testing - The Armory Life
Study] Home Defense Overpenetration: Shotgun, Handgun, Rifle : r
FBI Ammunition Protocol
The Rimfire Report: The Ultra Hot CCI Stinger In Ballistic
Ballistic-Gel Test: Magnum Research 'Thunder Snub' In .45-70 Gov't
10mm Loading Lessons - American Handgunner
7.62x39mm Gel Test - 7 Loads Put to the Test - Firearms News
Shotgun Over Penetration: FBI Ballistic Gel Test
Handgun Self-Defense Ammunition - Ballistic Testing Data
FBI Ammunition Test Protocol & Relevancy to Self Defense
July/August 1978 - American Handgunner
Federal Turns 100 But Its Defensive Handgun Ammo Is Only In - Handguns