OSS
when setting up.i use the scope as a measure point
works for me
but as others have said,just range it and pull the bloody trigger
if you calibrate your rifle to your range finder,then you cant go wrong,it only gets difficult if your quarry comes out at 47 yards as to 45 yards,which your aim point will be on your scope cap,all you need to do is adjust accordingly,and the Hawke SR pro scope is fantastic for it,example! as seen on VHTV the crow on top of the mast was 47 yards,i have no aim point on my scope cap for that range,but have for 45 yards "so adjust accordingly"