I know I have read this before but dang if I can find the thread, anyway... My local range has a 100yd limit. I am shooting a Colt Match Target Competition 20" 1-9 twist AR. w/ a Leupold Mark 4 6.5-20x50 scope. Black Hills 40gr. V-max moly rounds. Can I sight it in at a shorter distance and get a 200yd. zero? 25, 50yds?? Thanks in advance for any help.