Good evening everyone, I just picked up a Ruger American Rancher on 7.62x39 with a 16” barrel. I’m going to mount a ATN Thor LT 3x9 320 or a Burris XTR 15.x6 to it. My problem is I’m heading to the ranch Friday night and I don’t access to a 100 yard to sight it in but have a nice 25 indoor range I can hit up before I leave.  So if I sight it in at 25 yards what’s the zero going to be at 100? My longest shots where I’ll be hunting will be 100 to 150 yards.
Thanks everyone!

What is the muzzle velocity of your ammo and what is the distance from centerline of the bore to centerline of the optic?

ETA: I estimated 2 inches of scope-to-bore distance and with Russian FMJ going about 2290fps, if you're zeroed at 25 yards, your impact will be about:

2 inches high at 50 yards.
3 inches high at 100 yards.
3 inches high at 150 yards.