Originally Posted By: VarminterrorOriginally Posted By: calling4lifeTo figure out lead, set a baseline. Coyote runs 30mph, which is ___ feet.
Your round travels at x fps, meaning it takes it y amount of time to get to the coyote. (dependant upon distance to coyote)
Now figure out how many feet the coyote will travel in that y amount of time.
30mph = 20.45fps, ok, part one, CHECK!
Part 2, round travels at "x fps", 600yrds (1800ft) at 2670fps = 0.67sec.
20.45fps running x 0.67sec bullet time of flight = 13.8ft of lead. Yay, problem solved....
But wait, it's a little more complicated than "your round travels at x fps, meaning it takes y amount of time to get to the coyote"...
2670fps at the muzzle out of a .260rem, I'm assuming means a 140grn bullet, somewhere in the upper 0.5's... by 600yrds it'll be down around 1800-1850fps, total time of flight somewhere around 0.82sec, instead of 0.67sec.
0.82sec x 20.45fps = 16.8ft of lead. Pretty big discrepancy.
Moral of the story, garbage in, garbage out.
How much time do you really have to quickly check your dope card, assume a releative speed of the coyote, figure the azimuth of retreat, estimate the range, then accurately estimate your hold over displacements? Have you ever heard of anyone calculating the proper lead for a 12ga on a pheasant? You go shoot bluerock and practice.
Moral of the story, practice is worth a lot more than calculation.
You're assuming I meant muzzle velocity...
My point also wasn't to give an exact formula/answer, just to display there is a way to get the answer he seeks, I'm not here to do his work, he can, knowledge earned vs. given... Bla bla bla
Next, remember it, dope cards should be used as a backup for when you forget, or when stress has you blanking.
Next, no idea what bluerock is. Never known anyone that has 30mph movers set up over several hundred yards.
It is just to get a base, practice and instincts are valuable in all situations, but because I don't have a several hundred yard range with movers, I need something to give me a reasonable POA.
I've waterfowl hunted for 17+ years, I attribute my success on moving coyotes to it, no, I don't calculate exact lead in real time, but I'm not above admitting that if I knew I needed 6ft, it would help me to kill the bird.
My next scope is FFP with the horus h59, I paid for the tech, why not calculate leads on a running dog? Gotta get my drop and wind data anyway, sure, practicing on movers everyday would help, just don't have a legal range to do it, I can however do the calculations.
So just like remembering 600yds is 5 mil of drop, I can also remember it's a 10 mil lead. It takes a split second to assign a value outside of the calculated number, half speed trot= 5 mil, quartering= 5 mil, 578yds= 9.5 mils. May not be as exact, but again, at least I'd have something to go off of.
But maybe I'm the only one without access to a several hundred yard range with movers...