when in pre rut, i use just a regular buck grunt, and in late pre-rut, ill add the rattle bag to make it sound like bucks fighting over dominance, i recnelt called a buck in with 2 grunts, i would grunt ounce, and wait a minute and did agian and he came walking in, but during rut, the best thing ive ever used was the can call!!! it brings the bucks in running if there is any in the area..