The attached image is from:
http://www.lesjones.com/posts/002175.shtml
The text from the page where I got this said:
from left to right, the current 7.62x39 rounds: Ulyanovsk EM1 match (my fav round, accurate and yaws quickly) Klimovsk FMJ, Klimovsk "Silver Bear" FMJ (Identical), WOLF FMJ (note gigantic air gap), Barnaul FMJ, Uly FMJ, Early Klimovsk FMJ, Rare early brass cased TCW fmj.
Just wanted to share for those that may have not seen this before plus I am getting ready to start my own cut-a-way AK project and I had plans t do some ammo cut-a-ways as well so this is a great sample...
For those that may see the pic above, obviously you can't just grind into a live casing without the gunpowder going off and you loosing a hand! You need to pull the bullet first and remove the powder then you need to kill the primer by soaking the powderless case in oil before addint the bullet again and then make the cut-a-way. Sorry for the stupid warning, but I hate to think that someone might attack a live 7.62x39 case with a dremel and complain that I gave them the idea...