I think the MONARCH 3-12 BDC would serve you very well. Hard to go wrong with the ought 6 round. The MONARCH has very good glass and Nikon's reputation behind it. The BDC reticle will let you increase your long range accuracy by dialing in your rifle,scope and ammo with Nikon's Spot On Ballistic Program.
I have been using the 3-12 BDC on my custom Hill Country Rifle in .300 Win for years. Love it. So far longest shot is 427 yards and closest about 40 yards. All deer harvested were one shot stops, which says a lot considering I am not what I consider a great shooter even though I get in a lot of range time.
Here's a pic of my rifle and scope.
Nikon has a big PROMO going on right now knocking down the price of their BDC scopes.
Drop me a note if you have any question's.