20y of no yardage estimation!
So I have been reading a lot about the parallax associated with archery and it peaked my interest. This thread from The Hood back in 2004 http://www.archerytalk.com/vb/showthread.php?t=50250 has been of particular interest.
I have been using one pin at 30y for a while now with plenty of success. For my setup, POI is 3" high at 20y and 11" low at 40y. This is easy enough to compensate for and pretty easy to do so long as you know the yardage.
I used the equivalent of Range Cards in my stands to know all yardages of "stand-out" objects around me. It worked well enough, but if I forgot the card or rangefinder, I had to guess.
So, yesterday I decided to play with parallax. I ran some numbers through OT!2 and came up with using my 50y setting on my HHA. According to the numbers, it would give me the "flattest" possible trajectory from 20y to 40y. According to the numbers, by holding 12" low from 20y to 40y, my impact would never vary by more than 3" over 20y.
To confirm, I spent about 2 hours on the range last night. The numbers do not lie. Its incredibly easy to hit a baseball sized target at unknown yardage with this method. It's almost cheating.
The trick was just to set the pin at 50y and hold it 12" low at all ranges. It is actually really easy to figure out how low 12" is at any range (for me). On a deer target, that means aiming about 1/2 of a body width low.
I encourage more people to play with this.