I prefer to keep most of my deer shots under 400 yards with the 6 mm's . I don't want to lose a animal due to poor bullet placement . What a rifle and bullet combination is capable of under ideal field conditions and what most people are capable of under most field conditions are two different ballgames completely. Most hunters aren't as good shooters in the field as they think they are . Wind is your biggest enemy in the field and unlike paper targets , Big Game Animals don't usually give you a second chance if you screw up the first shot.
