This glorious round produced in the Motherland is the glimmering diamond atop our most priceless Fabergé egg . In the hands of a mere child, it can take out fascist animals from 250m away, and has. It does not use decadent brass like the capitalist pig dog Americans (Spits on floor) baby 5.56x45mm round for their garbage plastic toy guns. Instead it is encased in the finest steel that our citizens pots and pans could produce! So good is this round in training the troops, that it literally eats your glorious Red rifle to bits should you become lazy. When the comrade commissar sees this you would be beaten mercilessly until you bleed cabbage juice!
(lol, sorry. Always wanted to write one of those!)
Classic!!
In America, gun eats ammo.
In Soviet Russia, ammo eats gun!
The SKS will never be mistaken for a sniper rifle. It wasn't meant to be anything more than a shorter range carbine. So the guns we usually shoot them through aren't built to take advantage of a cartridge's inherent accuracy. Also, the stock SKS rear iron sight doesn't lend itself to consistently perfect sight picture, which you'll need to punch great groups at 200m and further, because the leaf edges appear blurry and out of focus, so your POAim can easily be off by at least 3 inches at 200m.
The surplus ammo we usually put through these, is not made with the level of consistency we get from Canadian or American surplus, or Western hunting ammo from known manufacturers.
Sooo...if you take 40 year old Commie surplus of dubious tolerances...and shoot it through an ancient SKS that's not been modified, don't expect particularly great groups.
On the other hand, if you get a good SKS with a great bore...smooth up the trigger mechanism...make the stock fit a bit better to the receiver and barrel (there are a couple of threads here)...replace the sights with either a rear peep sight, or a truly solid receiver mounted scope...and use good premium fresh ammo...then yea, apparently you CAN get quite good results from a slightly modified SKS in 7.62x39.
I also tried one guy's Mini-30 that had a heavy contour stainless barrel and scope...I think with good hunting ammo it was doing right around 1 MOA of accuracy, which IMO is doing well. Dunno how much that cost him though!