tested a couple of .45ACP through 1/2" plywood and into wet newspaper. Pistol was a Sig GSR 5". The test was cut short when most of the rounds tested blew clean through the test bucket, a 5 gallon paint bucket full of packed wet newspaper with a bit of soap added to help the water soak in. A 230gr Hydra Shok, a 230gr FMJ, and a 230gr SXT went through. The 230gr Gold Dot and a 185gr +P Remington stopped, but were packed with plywood. the EFMJ's in the picture are 200gr +P. After we found the first one, we fired a second to confirm. After that we gave up the plywood test.
I would have thought the Hydra Shok post and the deep SXT hollow point would have worked better. Oh well.
Thank you for your patience with the pictures, hope you enjoy this stuff. If anyone has any requests, we'll try.