Thanks for the photos.
But I would say it can do way better than this grouping.I got 4 9s and 1 10s when I had military training back in high school. (target circle radius is similar (maybe slightly larger) to your target). at 100 meters. We were only given 5 rounds per person. I was shooting a type 56 semi. Type 81 is supposed to have similar accuracy. Oh, besides, we were asked to shoot 3 rounds at prone position and 2 rounds at kneeing position. We were trained for a week for aiming skill before the range shooting.
I agree that the platform is capable of much better. I have shot tighter groups with both the CZ and multiple SKS's (just not on this trip). I am sure the groups will shrink with practice.