Although hitting a paper plate at a known 50yds is no great trick, I have never shot at a deer beyond 30 yards with a bow.
Well I have. I shot a little doe at 54 yards about 5 years ago. I use to shoot everyday all day. And on the weekends I competed in 3d archery. And your right, just a little bit off makes a huge difference. My shot was right on but the deer hear the string noise and barely move forward before the arrow hit and resulted in a GUT shot. I will never shoot over 30 (er maybe 40) yards again.