You need to do the same test at 50m to get a better idea of how well it will group, I've done target rifle for twenty years and most .22 ammo will give good groups indoors at 25yrd, it's 50m plus that it shows how good it really is.
Can't work out what diameter the 10 is, but 50m ISSF shooting the 10ring is 10.4mm diameter and the top athletes were getting 60 shoots within that shooting prone quite regular. Unfortunatley prone only is not a Olympic disipline anymore, it's all 3 position now