My local range only has targets out to 300 yards. I have a 100 yd zero and my come up for 300 is about 2.7 MOA. I asked to shoot on a farmers field to 500 yds. My come up and 400 is 6 MOA and 500 yds is 9.6 MOA. The bad part is I don't know my velocity. I am shooting 200 accubonds with 91 gr of H-1000. My book velocity should be close to 3000 fps. According to my actual values to the caculated I am more than a 1 MOA off at 500 yds. Is this typical?