You must be way down south somewhere to still be hunting and have the rut in full swing. Grunting won't hurt anything, but if he's locked up on a hot doe somewhere he won't leave her. IMHO hunting a good buck right before the rut starts and they go bananas is the better time to get him when he's just out cruising before the does really start driving him nuts. Once the rut really kicks in they are on the move and have no pattern for the most part.