There is no definite rule to either of those q's. I know about the 3rd or 4th day of bow season last year I had the big ten pointer I had my eyes on all summer and fall came in and bedded about 75 yards from me.

Had it been shotgun season, he would be on my wall right now. I tried to get him to move by grunting, he had no response and he stayed there for 2 hours before getting up and circling me downwind out of range. It was clear the call did not work, and may have in fact hindered my chances. But, the key to remember is that every case is different.

If I were to make a general rule, it would be to wait until the end of October before using the grunt again. But that is just my rule, and not specifically apply to your hunting area.