Everything that goes on inside the round, from the time the primer explodes until the time the bullet exits the muzzle, deals with internal ballistics. Ideally, I'd recommend at least one comes from a bullet maker, one from a powder maker, and one from a company that sells loaded ammunition. After the bullet has exited the muzzle of the barrel, you're dealing with external ballistics. Stabilizing the bullet is a function of velocity and the bore's rifling working together. It's the same with bullets.
Stabilization is the name of the game.
The farther you're shooting, the more of a concern this becomes. A relatively inexpensive device called a ScopLevel, which mounts to the top of your scope, goes a long way to completely eliminating this type of shooting error. These bullets, about ten or twenty times more expensive to produce, enable a shooter to worry less about wind drift than he ever could before with bullets having lead cores. Wind roll is another area that serious shooters have been giving more and more attention to in recent years. There have been some very fine articles on the subject written in the past year or so in Precision Shooting magazine.