There seems to be an overwhelming perception that light arrows are more accurate. They make it easier to kill small animals, far away. I believe it's the opposite, especially with broadhead tipped arrows. Wind has a greater chance to change the light arrow's course. Light arrows lose energy much faster at longer distances, and the animal is more likely to take a step causing a heavy-bone hit.

Personally, I wouldn't hunt an antelope without a rangefinder. If I know the distance, I'm positive I'm more accurate with my heavy arrows. I frequently practice with broadheads at 60-80 yards and I've verified that my extreme FOC, 650 grain arrows group much tighter for me. At 40 yards on live animals, no arrow overcomes reaction time, or inadvertent steps. If I make a good shot, I don't care if my arrow has way more energy than it needs. If the animal takes a step and I hit the shoulder or other heavy bone (antelopes have those), then I have a better chance of penetration to the kill zone.

My philosophy is to build my arrow to be lethal with my bad hits on whatever game I'm hunting. Everything works on good hits (well, almost everything). As a side benefit, my arrows give me more forgiveness and stability, enabling me to avoid more of those off-hits. Of course, my methods only work for those willing to do what it takes to know the yardage before they shoot. Flat trajectories are a distinct advantage to those who do not know the distance and it's over 30 yards - that doesn't describe my type of hunting.