Anyone use a 17 cal on coyotes? I'vs shot 2 so far, they hit the ground like a ton of bricks but it doesnt seem to kill them. I lost both of them. I used 17 grains for the first one and then 20 grains for the second. Like I said, when hit they go right down and when I go out to get them...they're gone! Thinking maybe I need to look into a .243 cal. Any thoughts?