" Going from the low lands to the high country will raise your zero a number of inches..... depending on the elevation[/quote].
Not really - unless one is going waaaay out there at 20,000 feet.
I just did some quick research. Between 0 and 20,000 feet the chart shows a difference of 3 inches in drop at 300 yards ..Presumably all other factors were equal.
That ain't gonna matter squat at 10,000 feet and 300 yards. or 500. It is not elevation that counts anyway, but air density, which is dependent on air pressure, humidity, bees flying by , butterflys in Mexico and all that other nonsense which only becomes important if you are a precision long range shooter, or some idiot shooting at elk 1,000 yards away. Or a SF sniper. The air pressure at one particular spot isn't constant anyway, so worrying about it is not just meaningless, but just plain silly.
For a 300-500 yard shooter on reasonable sized big game, it doesn't mean squat, Sight your rifle in at home, check it on location if traveling, and go hunting.
Strong wind drift and steep angle shooting are somewhat more important than "elevation" differences. Wind drift probably more so than slant for obvious anatomical reasons. The chart I looked at shows a 45 degree "slant range" at 300 yards will result in 5 or 6 inches difference in POI (IIRC) than the same horizontal range. At 500 yards slant range, it is more like 18 inches, so it becomes far more important past 300 yards. Up or down doesn't matter- the bullet is affected by gravity over the horizontal range it travels. It will hit high, so aim a little low, say just below body mid-line at 45 degrees and 300 yards.
Or lower still if you are an aorta shooter.
