I have my Aimpoint red dot zeroed in perfectly at 25 yards. I finally got the chance to shoot my second rifle outside at 50 yards. Red dot easily seen, but EVERY hole was a few inches above where the red dot was at. I know there must be a technical explanation on this and if I set my red dot below where I want the bullet to go it will go into the bulls eye. Is there a good site I can read on the technical aspects on how all that works? I didn't think a difference of 25 yards would be so great, and I certainly do not nor expect everyone zeroes their red dot all the time if they change distances. Just looking to learn and understand better.

