I've used the 7.62X39 for coyotes with the CZ 527, an Ishmash Bolt action, and several SKS. Normally use the standard Wolf or Baurnal soft point and hollow point rounds. I kept the Ishmash and use it with a 4X fixed power see-through scope rings mount for some calling where I can't be certain a shotgun will carry far enough (open CRP, sandhill plum thickets and some wooded pasture creek bottoms).
I've had very good luck with the round for coyotes. It doesn't mess a coyote pelt up like V-Max's are prone to do at short range, the round is very accurate in both bolt action rifles, it is inexpensive to shoot, and dependable.
For short range to intermediate range coyote calling, I'd say it is a very good choice.