It strikes me as odd that someone who considers themselves a marksman, somehow believes that 6x is only good for 200 yards.
Since I so often fail at finding what I want with the "search" feature I will merely mention he didn't limit it to 200 yards with a 6X for deer. He suggested 6X would be about max for 400 yard deer.
"Only Christ is the fullness of God's revelation." Everyday Hunter
