Then you have to consider that 9mm ammo is usually cheaper than .380 ACP, so you can practice more shooting for less money with the 9mm. So many things to consider. =)
Test Pistol Specs:
Diamondback DB9 9mm with 3" barrel
Diamondback DB380 380 ACP with 2.8" barrel
Federal Hydra-Shok 124 grain JHP 9mm
Federal Hydra-Shok 90 grain JHP 380 ACP
My testing process is simple. I take one shot with each pistol at alternate ends of a SIM-TEST block that is loosely draped with 2 layers of medium weight denim. I take the shots from 8 feet away and impact velocity is measured 5 inches away from the SIM-TEST block. My SIM-TEST blocks are now closely calibrated to ballistics gel density.
A full video accounting of the testing from range to final bullet recovery is available below.
Recap of Test Results and My Thoughts:
The Federal Hydra-Shok has been around for a long time. During it's lifetime, we can only guess how Federal has changed the design from it's original configuration. I was really pleased with the performance of the 380 and it closely matched my previous testing results. I was disappointed with the 9mm performance. It really didn't sink in when doing my initial recovery, but later as I was measuring the recovered bullet I realized the huge stretch cavity I had observed was probably caused by the bullet spinning 180 degrees after entry into the block. After the spin, the bullet settled into a rearward travel path with the bullet base leading the way. This would explain the deep penetration and lack of expansion.