You would be surprised what you can do at 6X. The shoot off targets we have at 200 yards are 1/2 scale chickens. -About as tall as a pop can, and about half that wide. Can hit them all day long at 6X. Shot a rock chuck at 388 yards with a 7x burris scope on one of my 6 BR's. The 3-12 Burris does give you more magnification should you need it, but light transmission and the field of view diminishes quickly as power increases. If you get a chance, take your 2-6X scope out and look at a target the size of a deer's vitals at 200 yards at 6X. I'm not bagging on the Burris, they are a great scope, but just sharing my experiences. If you can swing it, I would go with the 2.5-8X Leupy.
Good luck with your decision