With great curiosity I ran the numbers on pinwheel.com, the same program I use to set up all of my sights. Using a comparitive number I came up with the following.

A bow shooting 300 fps with a 350 grain arrow showed that if I shot a 33 yard shot for 30 yards I would drop 1.59 inches low.

Using the equation of 3 grains per feet a second, I calculated that the same bow would fling a 520 grain arrow at 244 feet per second. This arrow on the simulator chart showed that it would hit 2.57 inches low using the same yardage numbers. Which is just under 1 inch difference.

With this difference in mind. you would have to royaly screw up to be able to tell that you were 1 inch off in the boiler room of a deer.

pinwheel software can be downloaded for a free 10 day trial. If you want to really know what your arrow is doing, check it out and play with the numbers on the simulation page. It has helped me greatly