Originally Posted by Bigdog57
After tightening all screws, the best way to improve a Mosin's accuracy is to use premium ammo! Either good commercial or handload yourself, for what the particular rifle likes. Surplus ammo rarely gives decent accuracy (aside from the excellent Swiss GP11!)
I'm getting 1'' groups as 100 yards with Russian 147 grain light ball. It's also an ex-sniper, so that might have something to do with it.
Let me edit to add: Just because this perticular ammo shoots extremely well in my rifle, doesn't mean it will shoot well in somebody elses.