We think alike. You must have lost some, or tracked some that had been lost.
We've done more with .223 than it ever owed anybody, but coyotes are a lot tougher than some other types of animals.
They are tough, they are a predator, they are not real big, lots of fur but they can "power through" pain IMHO.
Also in my view I want as much wiggle room as I can for that less than perfect shot. Sure you could kill one with a 22 rimfire if you hit it right, but that is not the question. You are talking some distance, and a tougher mammal.
My vote that also means less then Niki's campaign is for two of the oldies, pure Fudd area. 243 and 22-250, both have legs to get out there, and both will put him down unless the shot was just....well should not have been taken.
There are some other oldies, but those two, really 243 you can find on the shelf.
I would run them through the rifle first naturally.
I love this photo, and generally say Willow is not a fan of Federal 243.
The story goes my rifle,
I tried several factory 243 loads, I got like 4 different boxes and all of them shot roughly equal at 100 yards. Close enough to even to call it even, Likely me being what the difference was and old eyes and irons.
But the Federal would not cut paper. Zero hits....none. I am really glad I did not start with that one because who knows what kind of tail chasing would have happened. Not one single hole in the target. I ended up pulling them down as they are really worthless to me as that is the only 243 I have.