Here's a summary of a slightly more realistic test (walls space apart to allow the light bullet to lose steam). Sorry, you'll need to read rather than watch.
http://www.olyarms.com/index.php?option ... &Itemid=26Two interior test walls were constructed using a wood 2x4 frame with standard drywall board attached to both sides. Two exterior test walls were made using wooden frames with drywall board attached to one side and exterior grade T1-11 wooden siding attached on the other (exterior) side. R-19 fiberglass insulation batting (Dow Coming) was stapled inside the two exterior test wails. To maintain test medium consistency, no wooden cross beams, electrical fixtures, conduits, or electrical wiring were placed in any of the test walls.
The test walls were placed in the following sequence to mimic shots fired from. inside a building, through two internal rooms, out the building, and into another similarly constructed building:
A. Interior wall #1 was placed 8 feet from the shooting position.
B. Interior wail #2 was placed 8 feet beyond interior wall #1.
C. Exterior wall #1 was placed 8 feet beyond interior wail #2. (Exterior side facing away from the shooter.)
D. Exterior wall #2 was placed 15 feet beyond exterior wall #1. (Exterior side facing toward the shooter.)
All calibers tested were fired from a position 8 feet in front of interior wall #l, so the bullet trajectory would travel in sequence through each of the succeeding test walls. Each caliber tested was chronographed and all firing results were videotaped for archive files.
The following results were obtained:
All handgun calibers exited exterior wall #1. This means they exited the "house" after passing through two interior "rooms," then entered another "house" to impact into the berm. The handgun caliber which demonstrated the least penetration was .22 LR Lightning.
The only calibers which did NOT exit the "house" were .223 (5.56) soft point and hollow point loaded bullets.
All projectiles demonstrated directional changes in their trajectory after passing through the first interior wall. The greatest directional changes (10 inches+ yaw) were shown by 9mm and .40 S&W projectiles.
Directional changes in bullet trajectory appeared to increase in magnitude with each test wall the projectile passed through.
If'n you're worried about blasting your neighbors, soft point .223 would appear to be the least likely to enter their house after existing yours (at real world distances).