Re: Dont know what happened at 800 yards
How about the bullets and cases being of dissimalr metals?? Perhaps they tarnished one another ever so slightly.
I have noticed a differance in the way my loads perform simply by cleaning the burnt powder from the inside of the neck or not.
There are 1000+ things that it could have been and not to belittle anybody, it could have been the shooter or highly unlikly, but air density, a dirty barrel...a bad judgment of the wind. Try loading some new rounds up to your normal specs and try it again. 2 or 3 times need be. Then and only then begin to worry.
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, 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.