Ive recently taken up the sport of coyote hunting and this is awesome.......i started out of necessity, because of the number i seen on my deer hunting grounds. in the past three years i have seen more than in the past 13 years. Im shooting every one i see, but are not killing them all... i shoot only two guns, remington 700 with 100 grain core-lokts, and my ar15 in .223 rem with 55 gr hp. i shoot the ar15 thousands of rounds a year, and a few boxes in the 700, so im familiar with my gun. ive shot at 12 coyotes since november gun season. i have killed 4, wounded/lost 7 and missed one cleanly. of the 4 i killed , not one dropped in their tracks. i even trailed them like a wounded deer... on the 7 i shot and lost im certain ive made what i would call a good shot on. these were hit and simply ran off, at full speed. i have seen hide/blood/fecal matter on these shots, for evidence that i did make the shot. and with the lack of recoil from my ar15, you can literally see the impact in the animal hide? Are they hard to kill? Shot placement, do you aim for the 1" behind the shoulder like a deer? different ammo? any input?