AR15?
Use a Barrett .50 for coyotes.
Get them just as they cross the border.
Wish there were 5 k of you....
Can we not just use a RPG? 6 inch trench motor?
Now, I admit an 8 inch howitzer is a little bit large, and is a might bit tricky to aim considering the wind speeds aloft are so uncertain, but an 88 mm high-speed bullet would definitely knock down your typical coyote.