Re: Muzzle Velocity at Different Altitudes
Theoretically, your MV could change an ever so slight amount due to less air pressure as the bullet moves down the bore, however, these changes would be so minimal that they wouldnt bear any real merit.
I nor anybody I know corrects MV for a given air density albiet many of us change our MV based on temprature and powders burn rates in a given temp.
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.