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!

Arma-Dynamics has a 25y target that'll give you a 100yd zero with x39 from a 16" barrel (AK).

It says it's for a RDS, but I've used them with a 5.56 AR & a 1-4x variable and had good results. I don't see why it wouldn't give you a ballpark 100yd zero on your 16" RAR.

Hey Buddy, Huge thanks for the info on the Targets. I printed a 25 yard target and sighted in with it using my Burris XTR 1.5x6 scope. then took it to the Ranch to run it at 100-350 yards. It was dead on at 100 and can use the ranging marks for out to 350 with ease.
I really like this rifle, Its a Hog killing machine and I working out a mount to carry it on my tractor.