I was trying to develop .458 Winchester 350 grain loads at 2750 fps to take on an African hunt with 450 grain loads at 2200 fps. At 100 yards the 450 grain loads shot about 6" higher than the 350 grain loads. Why? Because recoil raises the muzzle and recoil starts when the bullet is in the barrel. Heavier slower bullets stay in the barrel longer. The barrel was pointing higher, with the heavier slower bullets, when they left the muzzle.
This was kind of contradictory to conventional wisdom that faster bullets don't drop as much as slower ones. That's true but after they leave the barrel.
Since then, I don't take two kinds of ammo on the same hunt. With two different calibers, I found I could take solids and soft points on the same hunt but only if they were the same weight.
