I have had this happen to 2 rifles in a row - I bore sighted and “zero’d” at 50 yards, you know - get it on paper and then get it close to the bull. I then took my rifle, my 7PRC and then my 30-06, to 100 yards and I was dead on at 100. I was expecting to high at 100 - like the old rule for zero’ing at 200: Zero at 50, it will be high at 100 and zero’d at 200.
Anyone know why this is happening? The 7PRC is flat and the 30-06 is fast, but not so flat. I would love to learn the why on this one.
Has to be the bullet you are shooting and its speed just worked out that way.
Good question.
The closer the distance, the more the height of the scope above the bore impacts things.
If you think about it, the vision through the scope is a straight line and the bullet follows a path affected by gravity.
So the bullet has to climb about 2” to meet the line of the scope and then go above that line before coming back down and meeting the same point of the vision line at the target.
So you are saying if you have a scope that is closer to the barrel then 50 vs 100 yd POI will not be as simlar. Interesting. Makes sense.