Have same gun and scope and a 20 MOA mount. Mainly because I remember needing a 30mm a to get my bolt gun and S&B out to a mile in the turrets. No the 6.5 isn’t a mile cartridge, I just wanted to try it.
I’d bet that if you run the ballistics for your ammo in that gun and you’d probably be just fine to 1200 with a 0moa because of all the adjustment in the scope. Having said that though, a 20moa isn’t going to hurt you as you’ll still get a 100yd zero.