Originally Posted by
fingerz42
Even using your argument, if a deer STARTS moving it's limbs upward in after .2-.3 seconds, that allows .2-.3sec for the body to fall(load it's legs and rebound) if shooting 50-60 yards.
So using the equation 1/2at^2:
at 20 yards the deer cannot react (.2 flight time, w/ .2 reaction or .3 reaction)
at 30 yards the deer cannot react (.3 flight time, and .3 reaction time) or 1.92" body drop (w/ .2 reaction time)
at 40 yards 1.92" body drop (.4 flight time, .3 reaction time) or 7.68" body drop (.4 flight, .2 reaction)
at 50 yards 7.68" drop (.5 flight time, .3 reaction) or 17.28" body drop(.5 flight, .2 reaction)
at 60 yards 17.28" body drop (.6 flight time, .3 reaction) or 30.72" body drop(.6 flight, .2 reaction)
Now obviously a deer will not drop 30", as it will just load it's weight to bound away but anything over 30 yards becomes a guessing game and is dependent on guessing our shot placement and hoping the deer moves as we anticipate.
Please tell me more about how this isn't enough time for the deer to move prior to the shot...
Let's both recognize that this entire discussion is assuming that the deer's unabashed reaction is to get the he11 out of dodge, rather than simply LOOK for the origin of the sound. It has never been my experience in killing deer with a bow that they immediately bolt on the shot unless the shooter took a foolish shot with an alerted deer looking right at them.
More importantly for this discussion,
you've wholly neglected the travel time of sound. Unless the shooter is very stupid, they don't shoot a deer looking at them, so the only stimulus that they'll receive is the sound of the shot.
(I'll enter into argument here, without discussion, that having listened to modern bows at range to see how much sound they put off, at 40-60yrds, the sound of the shot is quite low, definitely not enough to cause instant flight for most deer - as has been my experience in shooting a deer out of groups in the field).
You cannot neglect the sound transfer time in this, as it's a substantial contributor to the overall reaction time and movement time of the deer.
60yrds = 164milliseconds for the sound of your string to reach the deer
300milliseconds to start moving AFTER HEARING THE SHOT
464milliseconds before the deer STARTS moving
Flight time is 600milliseconds
136milliseconds using a 1G drop = 3.35"
Using a 2 1/4" cut on a 6"x10" vital, that's plenty of margin for error.
Shooter accuracy tends to be a much more relevant contributing factor than "string jump". Way too many guys blame $hitty shooting on "string jump" as it hasn't been my experience that deer BLITZ OUT OF TOWN as soon as they hear a bow shot.