I'll object to that, .22WMR has been quite successful on coyotes up to 150 yds. Kinda depends on the shooter & whether or not he put enough scope (at least 12x-16x) on the rifle to make headshots at that range...but it does the job.
For longer than 150 yds and up to 1000 yds...6.5 Creedmore
.17 is definitely not enough. Even the guys that love .17 won't do coyote with it around here.