Go Mil/Mil and you will never regret it. Mil/Moa and you have an extra step to calculate.
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I don't have a problem using MIL/MOA. Either way, MIL/MOA or MIL/MIL, you still need a BC to dial in initial and accurate corrections. Based on your spot, or a spotter's spot, of a miss... you just HOLD the correction and fire a second shot. It's like wind, no one hardly DIALS in "corrections".
I say this in case someone runs across a great deal on a MIL/MOA scope... to me, it's not a deal breaker.