I apologize for sounding dumb but I am having a hard time wrapping my head around calculating MOA group size at odd ranges. For example, I understand that 1MOA at 100yards is approximately 1inch. So a 1 MOA group at 300 yards would be 3 inches. Well let's say you set a target up at 123 yards and you shot a .9inch group. What math do I do to convert that to MOA group size?