From the sticky...
I have a Norinco SKS I bought for $99 about 40 years ago. I recall a case of Norinco non-corrosive at the same time for another $99.
I have a number of SKS rifles, but this is my "shooter". I put a peep sight on it to help my old eyes.
I shot it today off a bench at 50 yards. Then sight picture was good.
I had 3 different flavours of milsurp ammo to shoot.
Tula - Russian copper wash case
Romanian - with the red stripe
Yugo - Brass case and lead core bullet
I know from past experience that the Yugo does not shoot well. I use it to pull the bulelts, dump the powder and then reload with a new powder charge and a good hunting bullet.
First I fired 5 of each. Each hit the target ok, so I repeated the test with 10 shots of each ammo. 10 shots is a more realistic test.
10 shot group size at 50 yards
Tula - 3.7"
Romanian - 2.9"
Yugo - 5.0"