[reynolds357]

Originally Posted by emcon5

Huh? Of course MV directly effects that.



You should absolutely confirm it at the range, but physics is physics, and the math doesn't change. Issac Newton will not be denied. You can absolutely run the numbers and predict with quite a bit of accuracy what ranges the hash marks will line up.

Any good ballistics program will account for all of them.

Having good average velocity from a chronograph definitely makes it easier, but as the OP did, you can work out a reasonably accurate muzzle velocity by working backwards from your observed trajectory. From this you can work out a complete trajectory, and figure out based on the spacing of the hash marks on your BDC scope what the ranges work out to.

Then you go out and confirm.

Yep, a good ballistics program is exceptionally efficient at calculating dope.