I live in AZ and the bear hunting is unbeliveable. I use several different calls when bowhunting bears and the one that works the best for me is a combination of a three tone jack rabbit and a call, called the cub bawler. It is more effective to use it after you spot the bear. Another method I use that is very effective is a diaphram (turkey). This gets em coming fast, I have used this call in AZ, New Mexico and Montana, and yes it works on GRIZZLIES too. Good luck in your quest for bear.
AZHOYT