I've hunted coyote before. It is totally legal to use electronic bait calls, they work really well. Also, if you hunt during the daytime, you can use something pretty normal, like .223 (I prefer a bolt action) so that you really have the range to reach out and get things done.
The only real problem is most coyotes are active at night and after dark you can only use a .22 LR for a rifle. I find that for extended distances, this really doesn't have the 1 shot stopping power on a large coyote that you'd hope for unless you make a very clean shot. For this reason, I find that after dark, the MA laws force you to be sort of non-humane... This is why they should allow suppressors, so we can use real calibers and not bother the sleeping little yuppies, and at the same time humanely take out the coyotes.