Idk. There's been so little mention of what it takes to make such a shot. Nobody said anything about verifying how close to zero a scope holds over time. You can kill any deer at normal ranges with a boiler room shot using a rig that won't hold zero within a MOA. It'll move around a little. You'll tweak it at preseason sight-in. That's not good enough for headshots.

Is your rifle, scope, load and mount up to it every time? Awful lot are not. Hardly anyone takes the time to ensure.