There is no formula.
The only means to accurately calculate BC from 2 velocities at a given distance, or 1 velocity with a known drop at a certain distance, or with 1 velocity and a known time of flight at a particular distance, is with a ballistic solver that brute forces the value by iterating through every possible ballistic co-efficient until the stars align (or rather its outputs match your inputs) and, walla, your 'ballistic co-efficient' is produced.
The above method has been fully tested, tried and trued to match MERO / Chairgun Pro.
So from now on, when someone asks, whats the formula to get BC from 2 velocities at a given distance ect, you say...a ballistic solver formulates that for you.
The why:
You cannot formulate or 'solve' Ballistic Coefficient without drag tables (which are velocity dependent) and knowing the flight characteristics of that particular projectile, which you feed into the solver by providing it two velocities at a given distance apart, or 1 velocity and a drop distance from POI and a given distance, or 1 velocity and a time of flight at a given distance.
-Matt
The only means to accurately calculate BC from 2 velocities at a given distance, or 1 velocity with a known drop at a certain distance, or with 1 velocity and a known time of flight at a particular distance, is with a ballistic solver that brute forces the value by iterating through every possible ballistic co-efficient until the stars align (or rather its outputs match your inputs) and, walla, your 'ballistic co-efficient' is produced.
The above method has been fully tested, tried and trued to match MERO / Chairgun Pro.
So from now on, when someone asks, whats the formula to get BC from 2 velocities at a given distance ect, you say...a ballistic solver formulates that for you.
The why:
You cannot formulate or 'solve' Ballistic Coefficient without drag tables (which are velocity dependent) and knowing the flight characteristics of that particular projectile, which you feed into the solver by providing it two velocities at a given distance apart, or 1 velocity and a drop distance from POI and a given distance, or 1 velocity and a time of flight at a given distance.
-Matt
