- Kind & Knox 250A (can be recycled and reused)
--- Best results
- Water
--- Demonstrates maximum projectile upset, but 1.6-2x penetration depth
- Clear Ballistics Gel
--- Not as accurate as the real stuff, but decent for pistol ammunition
- Clay and similar mediums over-emphasize the temporary stretch cavity.
- Dead tissue is less elastic than live tissue and can produce inaccurate results.
- Live animal testing, conducted well, is useful, but anatomical and physiological differences can lead to inaccurate conclusions.
Your best bet, without buying gel, is a water box.