Let me give you a little tip concerning rifle report. I don't know what a coyote thinks it is (the part that goes bang real loud), but I have shot one and called back the other. I have shot and missed and called him back. I have shot and hit, and called another in from the same stand, and I have shot and missed, and called another in from the same stand. And I don't know how many times I have shot and missed, and got him to stop for one more shot. Like I said, I don't know what a coyote thinks a rifle's report is, (thunder, sonic boom, back-firing tractor), I don't know. But your 270 will not disturb them anymore than my 2506, or 223, or some body's 22-250.
Now this information could be just my good luck but, if it is, I have been lucky since I started calling, and I started in about 1965.