Why try to convert it to MOA? He has a very expensive piece of equipment (one of the best) that is in mils. It's a system, adjustments and reticle are in mils. Learn to use mils... Why try to add confusion? All you hear about is how guys want everything to match, and when they do even that isn't good enough. I've got an idea, lets complicate things.
If you don't like it, sell it to me for what it's worth to you...next to nothing.