Article 35 - Simulated "Bone" wetpack
Wetpack test with 3/4" plywood to simulate the sternum bone.
Finally did the simulated "bone" wetpack after our range reopened. The pictures show the front side of the plywood "bone" with bullet holes, a picture of typical holes on the back side, and the main picture, recovered bullets from the wetpack behind the plywood.
As we had planned, the "bone" is a piece of 3/4" plywood which simulates (by comparative compressive strength) the sternum bone. I used 6" of wetpack behind the plywood and a 1/2" plywood backing behind that. The main purpose was to compare .380acp ammo with three different pistols, a Sig P232 (3.6"barrel), a P3AT (2.75"barrel), and a NAA G380 (2.5"barrel). Also included were a few .25acp shots with a Beretta 950 pistol, some .22magnum rounds from a NAA mini (1-1/8"barrel). And since I had my new Bersa 380CC to range test, one shot from it with a round of MagTech ammo.
We already knew that 9mm ammo would penetrate 3/4" plywood from Box-O-Truth tests. But no data on 380 or lower caliber, and no data on what the bullets do if they penetrate the plywood. Thus the reason for using a wetpack behind the plywood.
All rounds, except two, penetrated the plywood and continued into the wetpack. The two that failed to penetrate were the .25acp JHP rounds shown in the picture. Those two bullets were dug out of the plywood. Normally, no one would carry a .25 pistol, but if you do, only FMJ could be depended on to penetrate bone.
The little .22magnum bullets did surprisingly well, some keyholing as they penetrated, and all going 5" into the wetpack. Note that only the ammo shown could be expected to do that. More tests on other brands of .22magnum available would be needed.
For the .380acp ammo, the results are as follows:
Remington 102gr Golden Saber. All rounds lost their jackets, 3" into wetpack, bullets went 5" with expansion.
CorBon 80gr DPX. All rounds went 5 to 6" into the wetpack with the petals strangely folded inward.
Rem UMC 95gr FMJ. All bullets went full 6" of wetpack and were imbeded in the 1/2" plywood backing.
The MagTech (a JHP) fired from the Bersa380CC went 6" into the wetpack and did not expand.
All rounds produced a lot of shards of plywood into the wetpack along with the bullets.
Sorry, no chronograph readings, the temp was 38F and my hands were freezing, so I packed and went home.