Thanks for posting that Ganderite...
From what I've seen you post before, you're both a good shot, and honest about what you're achieving with your rifles. Now I have a benchmark to beat with my SKS accuracy project I've been working on in stealth mode.
Hint: Already beating 5" at 100 meters by a decent margin, but I'm using a MagWedge rail and a Vomz Pilad 1.4x-6x scope... It's both an "accuracy" project and a practical gun project. Given the range limitations of the platform (200-300 meters, realistically), I'm not interested in a high power scope, but something I can dial right down for snap shooting, but with enough magnification for good shot placement deer hunting at up to 200 meters.
Anyway, good shooting with Iron Sights. On my stock SKS, 5-6" is all I can get out of it on a good day at 100meters. I don't get too many good days though. I can get under 3" with my k31 most days, so I know some of it is limitations of the platform.
One thing I'm getting more of an appreciation for is a good trigger. The SKS has a lousy trigger. If I spend some time with my k31, which has a fantastic trigger, then move to the "grind it till you find it" trigger on the SKS, I'm hitting 8-10" groups. If I spend some time plinking with the SKS before benching some groups, thereby getting used to the trigger, I can bring that back down to 5" again.