B,
My main refute to the post you cited was that last line.
It's good too see that when confronted with evidence you admit that a 17HMR slug does not bounce off of Jackrabbits as well.
I say this about the 17HMRs and coyotes.
Anyone who shoots a coyote inside 100 yards 17HMR and loses that animal-
A) Does not know where to hit a 'Yote with a rimfire for sure drops- i.e. the C.N.S.
or
B) Can't shoot worth a damn..
Period.
In which case NO currently available rimfire load is going to make up for the shooter's shortcomings. There is not a rimfire round made- 17 OR 22 cal that will drop 'yotes consistently with any old hit in the thorax.
Blaming perfectly good equipment for sloppy shooting/bullet placement is the highpoint of stupidity.