A .270 will probably go through both sides, so the hides might take some heavy damage, but I wouldn't let that keep me from getting started. You can buy another gun later if this one doesn't work to your liking.

I do most of my hunting during daylight hours simply because it is easier to see. If a coyote is around and he thinks an easy meal is nearby, he will come running regardless. I have a .223 with a 3-9x40 scope, and I don't keep the hides (they are only worth something maybe 1.5-2 months out of the year here). I use both mouth and electronic calls, and both work as long as you set up properly(make sureyou can see coyotes approaching downwind before they get a chance to smell you).

drh1175, a 3-9 is the way to go for calling predators. 9x is more than enough magnification for coyotes even several hundred yards out, and I do not like anything higher than 3x for night hunting. At night, you need as wide a field of vision as possible, because the action is a lot closer.