Zero change with elevation

[sliceman]

I am an Eastern hunter currently setting up a long range hunting rig using a 7mm RM Sendero. I plan to obtain a G7 rangefinder to use with a G7 scope so that I can dial for distance. My question is if I hunt at 5-8000 ft elevation. will I have to re-zero at 200 yds (the original 200 yd zero being done at 500 ft elevation) so the rangefinder will be accurate?

 

[davkrat]

Only if the airline drops your rifle. At 200 yards with elevation change your zero might change a thousandth of an inch. At 600 yards it will change significantly but that's why you bought that fancy rangefinder.

Depending on which direction I decide to drive I'm 30 minutes from 200' elevation or 6000'. I can be below sea level or at 11000' in a little over an hour. I don't have to reservoir for any of the places I shoot.

 

[T3-OleMan]

I am an Eastern hunter currently setting up a long range hunting rig using a 7mm RM Sendero. I plan to obtain a G7 rangefinder to use with a G7 scope so that I can dial for distance. My question is if I hunt at 5-8000 ft elevation. will I have to re-zero at 200 yds (the original 200 yd zero being done at 500 ft elevation) so the rangefinder will be accurate?

The Temp change may be a bigger problem. My 338WM loves the Hornady Superformance 185 GMX. Superformance Mfg. told me the 3,080 FPS (on the box) was tested at 70 F and at ZERO F went to 2,997 FPS. That 83 MV-FPS drop was put into my ZEISS firing solution program so my Optimum Power settings would true my Rapid Z 800 crosshairs (it also uses the Elevation). Depends on your powder selection what the Temp change will do to you. gun)
GOOD luck.