Ruger LCP .380
Fiocchi 95gr FMJ
Hornady 90gr Z-Max
5/8" and 3/4" particle board
2 boards: First I stood up the long white board and clamped the small brown one to it as pictured. I propped them up with a stick as close to vertical as possible.
Both bullets fully penetrated and blew the back out of the second board as pictured.
3 boards: Neither bullet penetrated three layers of the particle board. Both bullets got hung up in the middle board, with the FMJ penetrating a touch farther as expected.
The FMJ did not experience any expansion, and the V-Max expanded but did not open much and retained all of its mass.
I'll say it before anyone else does, bad guys are not made of particle board. I was impressed with the way they blew through two boards. The third board provided enough resistance to contain them. It was fun experimenting.