Brass Jacket

[Don_P]

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.


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 



And the bullet, you can see on the right cut face where several teeth hit it and were deflecting around the hard metal.

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 

[flyingvan]

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...

[MountainDon]

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.

[UK4X4]

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