Smokey - I don't know about sea level, I've never hunted at sea level. <grin>
I learned back in the 80s from 'Gun Writers/Hunters' with a muzzle velocity of 3100 or so 3" hi at 100 puts you @ 4" hi at 200 then more/less on at 300 yds.
With that system at 400 yds you DON'T hold over the back line. On WT an ADULT will be 16"-18" deep SO up to 400 yds you're no more than 4" hi mid-range and at 400 hold on the TOP of the BACK the drop will still be a kill shot.
The exact trajectory figures will vary a little depending on specific velocity and BC of specific bullets. I've been using this system so long that it's second nature to me.
Obviously the higher the velocity the FLATTER the trajectory.
I remember John Wooters, J R S, et.al. using and recommending this procedure. That was before the popularity of turrets & knobs or dots. And the only 6.5 cartridge mentioned was 264 WM and it was viewed as a barrel burner.
Jerry
I learned the same from Bob Hagel and still run my guns that way from the 35 Whelen to the 7mm Mashburn...
