This is coming from a rifle noob. How do you buy a scope? I will be buying one for my Savage Model 93R17-FVSS. -Are scopes universally mounted? -What do the numbers mean? For example, 4 x 32mm or 3-9 x 32mm? -What should I be looking for in terms of range? I plan to shoot at a minimum of 100 yards. Maybe longer. -What are some brands to look at? Any other tips? Comments? Thanks.