When he says hunting positions, I dont think he means benchrest. Id like to see 3" 5 shot groups at 100 yards offhanded. I dont think many hunters even practice offhanded shooting that much.

I have monthly shoots at my place and they are all offhanded(no sling help either) with scope. We shoot at round 8" targets at 50 yards,some of the guys have a hard time hitting the target all5 times(we fire 5 shots per round)Unless you consistantly practice offhand shooting much better then a 6" group at 100yrds with a hunting caliber(222(ish)+ centerfire) is exceptional a 3" 5shot group is unbelievable. IMO

Off the bench if a gun is under 3" at 100 its plenty accurate for Whitetails. Any worse then that Id start to wonder if something was wrong with the gun or try some different ammo.