So this is discussed in depth online, but my search here was unsuccessful. My simple question is, is there one round that can be used for coyotes, bobcat, and fox. The reason I ask is I have been using my AR 15 and have been shooting 55 gr Hornady varmint bullets. This seems to be ok for coyote, but not for fox, they seem to explode. I know a lot of people use the .17 caliber for fox only, but it's not enough for coyotes according to my research. So it would be nice not to have to carry multiple rifles. Any suggestions would be great. Oh and I would really like it if it was a .223 round. My wife would not be ok with me buying another rifle right now. Thanks in advance!