Not to hijack - but this zombie stuff is steel, yes, which does suck for the cost of the rounds - but it certainly is the most accurate ammo I've fired out of my sks.
With surplus and a red dot sight at 50 yards, I consistently get 4-5 inch groups (real groups, not internet claims of 2moa with surplus).
With the zombie ammo, it shrinks to 2-3 inch groups with some rounds touching.
It's clearly more accurate! I love it, but I'll be sticking to my surplus as I just like to shoot paper targets with mine.