The Box O' Truth #1 - The Original Box O' Truth - Page 1
".22 Long Rifle (Wildcats) - 4 boards and bounced off 5th board.
9MM JHP (Federal) - 8 boards, bounced off 9th.
.45ACP (Federal Hydrashocks) - 7 boards, bounced off 8th."
9mm penetrated more than .45.
Even Glaser Blue-Tip penetrates several layers of drywall:
The Box O' Truth #4 - Miscellaneous Rounds Meet the Box O' Truth
Tumbling is a result of bullet design- usually the nose is hollow, or filled with a lightweight material such as wood or paper. The bullet is stabilized in-flight by spin; as soon as it stops spinning, physics takes over and the heavy end wants to lead, so the back end comes around to lead the way. This is tumble. The British .303 tumbled, as it was designed after the Hague agreement on dum-dum bullets. The nose was hollow, or filled with paper or wood; the Russian 5.45 does the same thing. It's a 25mm long projectile 5.45mm in diameter, with the front 5mm being a hollow core. When it hits, it tries to swap ends, so the heavy end can lead, and this results in tumbling.
Handgun rounds typically don't tumble, as they're not long enough to destabilize like that. Heavy-for-caliber bullets can be made to do it by handloaders- I've read about people using 200 gr roundnose lead bullets in 38 S&W handloads as they
can tumble- it's long for the caliber- but it's nowhere near a sure thing.
hth