Originally Posted by JonM
i havent come across a ballistic proggy or ballistic chart accurate enough to replace trial and error by physically going out shooting and measuring bullet drop at known ranges.
You are correct. There are just way too many varibables that will affect the ballistic performance of any projectile.
The charts/programs are useful for giving one an idea of the what the performance will be like and approximate the bullet drop and such. If empirical evidence diverges significantly from the ideal, then you know something is amiss and can take steps to correct.