oldelk - my friend gets predator magazine and I get to look in them once in a while. I did see in there several times about a 50 cal air gun that is supposed to be pretty potent on coyotes but range is limited to 50 - 75 yds I think.The company that makes it is Quackenbush Airguns.
Some may say that its too small but from a good rest and the accuracy of the 17HMR, I don't think someone who shoots as much as you shouldn't have any problem poking them in the ear out to 100 yds. And the noise problem would be minimal.