10mm Double Tap 230 gr Equalizer fired from 4.5" barrel EAA Witness through four layers of denim into calibrated gelatin.
BB: 580.2 fps, 3.7"
Impact velocity: 947.9 fps (approximate)
Penetration of 95 gr ball: Greater than 30.0"
Penetration of 135 gr JHP: 30.9"
Retained weight of 135 gr JHP: 134.8 gr
Expansion of 135 gr JHP: N/A
Some explanation is warranted on this one. The bullet did not make two separate impacts as advertised. In fact, both projectiles remained together for roughly 18"-20" of travel through gelatin. The JHP did not expand but it did deform at the base where the ball pressed against it. The jacket appears to be copper plated steel. The 95 gr ball exited the block at about the 30" mark.
The video is posted on my YouTube channel, if you are interested.