az300wsm, the optics you choose is mostly determined by what you want to do with the rifle and how much you want to spend. I have 6-20x40 Bushnell Scopechiefs on both my Marlin 917V and 917VS, and a Bushnell Elite 4200 4-16x40 on my CZ452 and a Swift 669M 6-18x40 on the Sportster, so you can see that I like to shoot small groups and be able to take ground squirrels to the limit of the 17hmrs range which can be in excess of 200yds, easily.