As far as cow calls go. You'll probably want a couple.
So you sound like different cows. You might want to
try a "hochie Mama" call, easy to use. Beware of
calling if the Elk should be able to see the cow and
just like any other calling situation don't over call
can be worst than not calling at all. If your hunting
along and can call then have time to very quietly
move a few yards forward and slightly to one side
so your not right where the Elk are going to be looking
for you that can be helpful. Good luck.