What about varying bullet types? (not composition or weight) like FMJ or HP?
Not all Hollow Points have the same profile as the same weight FMJ.
This can change the bearing surface of the bullet, (the length of the straight part). More surface area = more resistance = higher pressure with the same powder charge. Usually the difference is so small it doesn't make a difference.
But...some manufacturers list different charges for some of their Hollow Points. Speer Gold Dots in .45 ACP as an example.