Re: Confusion on My Ballistics
This is one of the reasons I dont use a 100 yard zero for a referance.
For example: say you are zeroing at 100 yards on a 1" target and your .3" group is inside that circle but its .4" high inside that circle. It may be an acceptable zero for 100 yards, but now you are truly zeroed at 150 yards instead of 100 yards exactly, even though you are hitting small targets at 100 yards.
If you do the math at 90 degrees F. and 800' with slightly lower than standard pressure say .4 inches of mercury and are .4" high at 100 yards you will only need 2.8 MOA to hit at 300 yards. If you do the same math with a true 0.00" zero at 100 yards then it will be 3.27 MOA to hit 300 yards.
Bottom line: I might carry may rifle afield with a 100 yard zero, but when it comes time that I set up for a long shot, I use a verified 300 yard setting as a starting point.
Hope that helps
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.