3X9X40 is a good scope for deer hunting. Most scope face hits are short eye relief and shooting from a prone position. Most scopes with a 3" eye relief should keep things from face contact. This is simply the distance from the eye to the scope that allows the full diameter sight picture to be clear. If your scope is correctly set up for you then every time you shoulder the rifle the scope sight picture will be clear. Everyone's rifle/scope mounting should be set for them and then re-sight the gun at the range. As for scope brands, Leupold is a great make, the older Redfields hold up to anything, don't know about the new ones, Burris, Nikon, lots out there to look at.