400 yards is not something I’d want to shoot offhand, but 400 yards ain’t chit with today’s bullets and optics and a good rest. I mean for gods sake most of us sight our rifles in with 200 yard zeros and strive for 1” ish accuracy. I walked my father in law through killing a bull elk at 400 + a couple years ago and he’s never even shot that far in his life. All it takes is a good range finder, mild wind and a spin of the turrets. A little practice at longer distances would make this very clear for those questioning it.
