I hit this sucker the other day, of course I had less than 500 board feet into the new teeth when I heard "zing", notice to the right of the bullet you can see the heavy scratch where a tooth took the metal out of the cut, chipping tooth the whole way.
(http://timbertoolbox.com/sketches/bullet1.jpg)
this is the entry side, notice the bent fibers. It was also my warning if I'd been on my toes. I saw ants coming out of the hole but figured "ah it's just a rotten twig hole"... notice there is no swirled branch wood surrounding the hole... it couldn't have been from a branch d*
(http://timbertoolbox.com/sketches/bullet2.jpg)
And the bullet, you can see on the right cut face where several teeth hit it and were deflecting around the hard metal.
(http://timbertoolbox.com/sketches/bullet3.jpg)
Question is, what is the purpose of these? I've hit copper and it doesn't do much damage, even centerpieced one in a desktop. I can only assume this is hard on a barrel too ???
http://en.wikipedia.org/wiki/Hollow-point_bullet
Plated hollow points used to get clad with steel. They'd copper coat the steel to protect the barrel and get less lead fouling.
I bet if you started a bullet-in-wood thread you'd get a fair number of contributions...
or a military surplus round. Lots of WWII surplus ammo is steel/iron cored and jacketed. We have a rule against using that at the gun club range because of the danger of starting a fire due to sparking when hitting rocks.
7.62 nato rounds are lead filled cased rounds
I fired quite a few thousand rounds of them while in the military....luckily never with anyone shooting back !
FMJ rounds
http://en.wikipedia.org/wiki/Full_metal_jacket_bullet