...excellent topic...

...i can only speak from personal experience, which is with an ou 9.3 that was regulated at 60 metres, and that came with a factory target showing four shots (bottom/top + top/bottom)...the b/t + t/b shots were at around 0.50 moa...

...my own testing using the fixed express sights at 50 yards on a bench (again, four shots) was 1.0 moa for the first pair, and 0.75 moa for the second pair...

...if i were to scope the ou, and use the rifle as a ss, i believe that the rifle would as accurate moa-wise as my best small/medium bore turnbolts...