I shoot 3-under and don't really "gun barrel" the arrow at all if I'm inside 25 yards. I feel like it's mostly instinctive. Sure, I can see the arrow in my peripheral vision and it IS somewhat of a reference point, especially for windage, but most of my focus is on the spot I want to hit. Like Jamie said, once you shoot enough arrows it begins to feel automatic, and more "instinctive." On the other hand, when I shoot out to 40 yards, my arrow point is right on the money for that yardage... so I make a conscious effort to gun barrel the arrow. This is just for practice and fooling around of course. It's really fun to watch a feathered arrow fly 40 yards in a huge looping arc and finding it's way to the vitals of a foam target. My opinion is, it doesn't matter how you make that arrow find it's mark. As long as it makes you smile that's what counts. The bottom line is you're still shooting a bow without wheels, sights, a rest, or anything else.