Mr. MWC;
First off I would like to welcome you to the Campfire from southern BC.
While I�m sure the chap in your video has shot more coyotes than I have, we have shot a couple here and there.
The last two died with a .22 rimfire using CCI Velocitors, which is what the yard guns get fed.
We have shot them with various calibers from .223 up to .338, but the original �coyote rifle� is a much too heavy .22-.250AI. I will admit that last year I borrowed our youngest daughter�s deer rifle to shoot a coyote and it worked quite well too. It is chambered for another wildcat round, a .22-.250 necked up to .250 and blown out to AI specs.
In all seriousness, the next coyote rifle I build will be a light .223, maybe an AI just because, but I�d be shocked if any coyote would tell the difference.
Good luck on whichever way you decide for a coyote rifle.
Regards,
Dwayne