Yup, you can. A lot of the milspec and SWAT guys run 10x max and we make hits with that just fine. Hell, you can almost see it with the nekid eye.
I can shoot 100yd targets with irons just fine. Not spectacular, sure, but fine. With a good target peep sight 100yds is fine with irons. I can hold 2.5” groups with M1 Carbine sights for cripes sake!
12x scope at 1200yds is the equivalent of the MkI eyeball with crosshairs at 100yds. Sure, if I was going to shoot that far I’d rather something like a 24-30x sight. Or higher, but a 12x max would be okay.
I prefer at least 2x per 100yds, but I am fine with 1x per 100.