Several years back we used to shoot at 500 yards (Lake Stevens?). I was shooting Winchester AccuBond loads (.300 WSM) so I got a Winchester Products Guide at a dealer's and read their chart. I zeroed at 200 yards......and the chart told me that the bullet would drop approx. 36 inches at 500 yards. The targets at 500 yards were 6 feet tall. Aim at the top of the wood frame and the bullets dropped into and around the center of the target.
More recently I bought a Remington 700 Long Range (.300 Win Mag) and it is zeroed for 300 yards (I anticipate shooting between 300-400 yards). For 300 yards, I would just hold where I want to hit......hold over a few inches for shots between 300-400. That's about as scientific as my knowledge allows me to get.
Also went from a Burris Fullfield II, 3-9x40 to a Burris Veracity 2-10x42 scope...…..and what a difference......just for hunting, not really for longer ranges. But perfect in that 300-400 yard envelope.