Underwood Xtreme Penetrators Clear Ballistics Gel.

[5pins]

9mm, .40S&W, 10mm, and .45 shot in clear gel for penetration.

http://www.general-cartridge.com/blog/underwood-xtreme-penetrators

[Bluebird5000]

9mm, .40S&W, 10mm, and .45 shot in clear gel for penetration.

http://www.general-cartridge.com/blog/underwood-xtreme-penetrators

Thanks for the excellent test. From what I've seen (in your tests and elsewhere) the hardcast is definitely the winner to get deep penetration but these XTreme penetrators are an interesting intermediate choice, especially if you are in a lead-free area or you want a little less penetration but more than a JHP like the XTP or 180gr Trophy Bonded.