Jack - It is refreshing to hear someone other than myself make a distinction between Eastern and Western coyotes and terrain.
Hard for some folks to acknowledge a difference in both coyotes and caliber needs East and West. I know a smaller caliber is completely reasonable for Western calling, and quite effective there for many reasons. For the same reasons, sub-calibers stuggle in the East.
I have only hunted Western style once in Colorado before the area around Denver got so crazy with development. Coyotes were plentiful, but small. Average size was much, much smaller than the East. I make no judgement on this fact other than a smaller animal is much easier to kill.
Jack, I am in agreement on your statement that 223 is a minimum caliber for coyotes. I have killed large Easterns ( 50 plus pounds) with the 223, but it was good fortune to get a perfect shot on him.
I would have to get the optimum calling caliber in the East at .243 Winchester, and the 22-250 making up into a reliable killer of Western coyotes.
223 is a slick little round that works adequately on coyotes, but it struggles here in the East at odd angles, and the snap shooting so common in the forest here.
I would say the 223 is so popular because of the AR platform, and good ammo availability moreso than its a devestating coyote round.
If you have hunted with a 243 or 22-250, you will quickly see the difference in decisive coyote kills. Some folks need the extra punch, many do not based on hunting styles and terrain. For those folks the 223 Remington will get the job done well. /ubbthreads/images/graemlins/wink.gif
I use the 223, 250 and 243 mostly, but feel most comfortable with a .243 in my hands.