Another Land Surveyor here. I use Pointblank also, but mostly I don't worry about the balistics too much. As long as I get a nice, tight group at 100 yards, at a decent velocity I am happy. Then it becomes a matter of shooting at various distances to see where the bullet is hitting. The balistics programs can give a good idea, but nothing beats actual field time. Sort of like looking for that elusive corner monument which your calculations say should be right here but experience tells you it probably isn't....
-WH-