Originally Posted by Big Bird
Insert all the stuff that Big Bird said...
Paraphrashing what big bird wrote:
Load development has a large role to play in where (along the flight path) a bullet will go into the subsonic speeds. BC of the projectile gets a vote here.
Environmental (particularly the density altitude and wind conditions) can wreak havoc on your attempts... Ballistic solvers are all well and good, but the bullet really tells you what's going on.
True the ballistic solver and then you have the no-crap answer as to what is happening between the internal and external ballistics of your rifle/bullet combo.