Thought I would get brave and order a turret style long-range scope (really medium range).
Got the Leupold VX2 CDC 4-12-x40 to top off my Browning A-Bolt Ti mountain rifle in 300 WSM.
First I had to break in my new rifle. Then the deal is you zero in your rifle at 100 yards or 200 yards, depending on what you ordered, and then you just replace top adjustment knob with the custom one they send you.
For me, I dialed in at 100 yards, put on the custom knob, then cranked it to 300 yards and sent a three round group downrange. I shot a 1.25 inch group at 300 yards. I am not saying the scope was responsible for that group alone, but it helped. I just got lucky with my combo of rifle/scope/loads too.
I highly recommend the scope with CDC. I cannot wait to take some 600 yard shots at a range when I can. I got the scope new off of Ebay for $500.00 and the custom knob was free.