A few ways to increase accuracy. Esp if you reload.
1. Fire commercial factory ammo in it. Does this group meet with your satisfaction? If this works, you can still use suplus ammo but you will need to make some adjustments. (ie., pull the bullets, dump the powder, weigh the powder from 10 rounds to find an average, re-charge all of the rounds with this new uniform charge of original powder. I have found variances of up to 2gn in powder weight in the same box of 20 surplus bullets. (I do this especially for hunting rounds. I change the bullet to a hornady but I may go to a barnes next year) I am definitely going to try that V-Max).
2. (Take your SKS to a gunsmith if you can't do this in a straight line.) Using a 21/64ths drill bit, drill into the barrel from the muzzle end 1/2" to 1". Make sure you flush out all of the metal chips before you test fire. (You could just have someone cut the end of the barrel off and re-crown it, but this may ruin the look for you...your call) Most of the SKS's have suffered from years of improper cleaning practices and having a cleaning rod drug over the lands at the muzzle will quickly ruin the crown. Going slowly and straight will also allow you to create a new crown inside the barrel. Now, find a brass screw (you may have to turn it down a little to get it to fit) and chuck it into your drill. Use the head to polish up the new crown you have made.That should cut your groups in half.
3. Smooth up your trigger group. Youtube is good for that. Search SKS trigger group jobs.
4. Make sure that your action is bedded. Yes you can improve the bedding of an SKS.
If you do all of these and your SKS still won't shoot 2" groups, then send it to me. I have done this to 2 of my 4 SKS's that shot 4'-8" groups and they all shoot 1-2" now at 100yds.