I use one a lot from muzz season up to the end of gun. i have called in a lot bucks. If i see a buck not moving my way i will use it. if i hear a doe blow at me or for whatever reason i use it. if i hear a stick break and i think it could be a deer i use it. 2 or 3 grunts is all , usually pretty soft calls. sometimes loud. i was hunting one day last season. had seen a few smaller bucks and as always i grunted at em to judge their reaction, soft grunts. not really much reaction. finally saw what i thought was a good one headed away from me. I grunted pretty hard at this one, 2 grunts, and about 10 to 15 seconds later he reappeared out of a thicket walking right to me. he was about 150 away when he popped back out and i killed him at 35. this scenario is not uncommon for me.