Ok so im purchasing a 7mm Rem Mag, but the whole scope thing has me confused. For example the power and what not. 3-9, 4-12, and 6-18. What does this mean. Sorry im not too smart about the scopes. But otherwise than that i have found 3 scopes, Nikon Buckmasters series, Leupold Ultralight Riflescopes, and Leupold Fixed Power Riflescope... Any good news on any of these? thanks and responses would be greatly appreciated.