As far as how they shoot, just stick to gun basics when picking out your rifle such as overall condition, tightness, condition of the bore (not pitted, rusted etc.), condition of the rifling (amount left, good/prominent rifling left) in the bore, condition of the chamber, receiver, bolt, smoothness of bolt ETC.. If you pick/buy it in person have a good look at her for things such as these. If buying online try to get these qualities if possible. Finally put some decent ammo in her and she will shoot, the rest is up to you. Mausers are great and historic guns, have fun my friend.