Thanks everyone for the great advice! I know I do tend to worry about things too much. I just would hate for the muley of my dreams to be sitting at 600 yards, and me saying "damn, I shoulda bought the X scope instead of the Y scope." I say that, even though I could hunt the rest of my life and never come up with that situation.

The coyotes do tend to hang up right around 400 yards though...bastards! Maybe I should spend more time working on my calling technique and worry less about the scope?!?!