Thread: 7mm rem mag factory ammo cds data

Altitude and air pressure can make small differences to trajectory out past 300m but realistically unless you're reloading and shooting 50 rounds to set up your system, you won't be able to allow for this.

There is a thread here with altitude and ballistics.
Roughly:
100m ASL 1000 hPa
500m ASL 950 hPA
1500m ASL 850 hPa
put those into strelok and see what you get.