I havent shot my sks (yugo 59/66A1) for accuracy yet, but off a rest at 100 yards I can consistantly hit clay pigeons. My mosin nagant (1944 carbine) I have shot for accuracy and with brown bear 185 grain FMJ ammo it shoots just under an inch at 100 yards, with most surplus ammo it still manages 2 to 3 inch groups at 100 yards.

Heres a picture that was shot at a fast rates of fire with my SKS and some full auto fire with a thompson just for fun at 100 yards. Notice the grouping in the forehead that was with my mosin nagant 1944 carbine.