It's amazing what the big bores will do. I was out pig hunting with my 458WM bolt gun earlier this year and had a mixture of loads, ranging from sub-sonic lead (good rabbit load) to "normal" 500gn FMJ loads. After getting a couple of pigs, and heading back to the car, I tried out some of the FMJs on inanimate objects.

I shot a large rock, which disintegrated, and found a chunk of the fired projectile - it had blown apart. It was too hot to hold in my hand, even after the minute it took me to find it.

I then shot at a 5" tree branch with another 5" branch behind it, expecting that the second branch would allow me to find the spent projectile - wrong! The projectile went straight through both without any signs of expanding, but I guess they are not meant to, are they?

(Note: I made sure I had a safe background in both cases before I did this. The rock was in the bottom of a dried up section of waterway - I fired down into it, and there was a far side steep sided creek bank behind the tree that was inaccessible for me to try and recover that projectile, I didn't bother looking for it but probably should.)