Calling during the rut involves picking a spot, emulating moose vocalizations, waiting, then moving and trying again if there’s no response. If we don’t hear an immediate response, most of us choose to cover ground. This can go both ways. I know very productive moose hunters who believe in calling for up to two hours in one location, regardless of whether they hear a bull grunt back or not. As a rule, call for at least 15 minutes in any given location before moving on.