Ballistic Solvers
Bryan Litz, a ballistician at Berger Bullets and Applied Ballistics, talks about using ballistic solvers such as the Whiz Wheel to obtain a firing solution.
While gravity and wind are the main influences on a bullet’s path from the gun to the target, there are some other important things to consider. One of these is the initial bullet speed. In effect, a bullet 'loses power' the moment that it leaves the barrel of a gun. As a result, generally speaking, longer barrel guns produce speedier bullets, which equates to less time to the target, and less time for gravity to do its thing. But just because a bullet is faster doesn’t mean it’s necessarily better overall.
/NSSF