Wow, this is an old thread. But, since it has been resurrected, I have a lot more experience with dialing a scope to its limits.
I have numerous Tangent Theta TT315M which is a dual turn 6MIL elevation knob, whether you have a 0, 20, or 40MOA rail. You ONLY get two turns, or 12MIL total elevation travel.
I dial all of them to the max, and still need some holdover almost monthly (1400-1500+ yards). I have seen no ill-effects in these scopes either.given your use profile, I'm surprised that you don't go for something with more than 12 mil