Originally Posted by jeepinjeepin
Is there any correlation between steel and brass cases and corrosive powder charges?
FWIW, it's the primer, I believe, that is the difference between corrosive and non-corrosive.
There is a lot of information on the Internet about ammo head stamps and packaging. If you poke around a bit with that information you'll probably find out beyond a reasonable doubt if it's corrosive or not.
For example, I recently picked up a 1/2 dozen boxes of 308/7.62x51 ammo in light green boxes and the cartridges have head stamp .308W OO 82. A couple minutes browsing around with that head stamp info suggests the ammo is most likely corrosive.