At that range I would just go with an RDS aimpoint, trijicon or eotech maybe add a 3x magnifier. There is no need to dial, if you want magnification consider a 1-4. 1-6,1-8,1-10 from Horus vision, Bushnell, Trijicon, Vortex, US optics, Nightforce, Premier Recticles, Kales, Meopia there are more of course. Here are some examples. I am waiting on new US optics 1-10.
Nikon m 223, or p223. M is the monarch p is the prostaff. M has better optics. Both have bullet drop turrets built in. Zero at 100. Then just turn the turret to the range your shooting and they are dead on. Never heard a complaint and I recommend them to everyone. Hope it helps.