Bullet coeff

[eddiesindian]

A lot plays the BC. I've G7 to be the most accurate for BTHP Match type bullets. I start with the manufacturer BC, get my velocity from a chrono. Then true my DOPE with actual drop data and adjust my velocity in my calculator.

One of the factors will most likely have to change in order to true your drop data. the easiest to adjust is velocity as 99% of people don't have the equipment or mathematic ability to recalculate the BC. If you're using G1 then you need to calculate the trajectory at multiple distances as the G1 function changes as velocity falls off.

I have not read Litz's books, but this is my basic understanding from self tests since I shoot at multiple locations ranging from 400ft above sea level to 5,000ft above sea level. Once I have true my data making atmospheric adjustments is pretty simple and for the most part spot on within 1000yds.

that's pretty close to what ive done.
Ive done my own math and have come up with a formula that's worked for me for years providing I have correct amount of drop at any given distance.