I was chatting with a pal about this the other day... He did the math...
3 matters to consider:
1. Distance from you to target
2. Ave speed of bullet over that distance
3. Speed of moving target
Using 223 ballistics table with initial FPS of about 3200.....
General Rule of thumb we came up with was to lead a good running coyote (20-25mph perpendicular to your position) at 100 yards by aiming a lead of about 1 to 3/4 of a coyote-length from the leading edge of his chest area in order to hit the vitals area. (approx 4ft change in distance over time)( moving coyote appearing to equal about 3-4ft length)
A "loping" coyote (5-10mph) at 100yds was "aim under his nose" (approx 12-18inch change in distance over time)
I do believe coyotes are capable of short bursts near 35 mph... so you need to judge that one out as about 7 ft difference at 100 yards.
average speed of the bullet is faster at shorter distances, so 50 yards isnt exactly half of those other calcs...
Robb
------------------
"Happiness... is a Target-Rich Environment"
(edit for spelling... again)
[This message has been edited by Robb/Scottsdale/AZ (edited 07-21-2001).]