Is it safe to say when figuring MOA that you just take your known bullet drop and divide by distance? For example, hit a hog at about 285 today. I know my 6.5 creedmoor 129 superperfmance round drops approximately 7 in at 300. So i went up 2 moa +1 for 9 clicks and drilled it. I understand there are other factors but will this formula work for a general rule?