1500 meters unranged.... thats interesting. Would have to be done with a scope with nothing but a straight crosshair in it, no other way to cheat ranging by mil type sizing.
Beyond that, its not realistic at all, no sane long range shooter would attempt a long shot without checking the range.
I'd love to play this, I'm out though, not in the cards of my life right now plus I'm so rusty I suck shooting wise lately. Missed a doe head due to a screw up on my wind guess the other week, measly 252 yards. Had the wind right... but then looked it over hard and decided that the ridge and trees blocked a fair amount of it... I was wrong, it was my first calc at full value... of couse the second berger put the brain on the ground and then she fell.