Hunt the doe's. I love to rattle. I rattled in 5 different buck in 2 hours last year during the rut. When I rattle I invision watching the two buck fighting, then at the end of rattling I grunt however many times I feel at that time (usually around 5 times).
If you have a chance to do any scouting watch the doe's. They don't change their routine, the bucks change theirs to meet the does. What I mean by routine is funnels, feeding, bedding, and watering. Good luck the real experts will chime in soon!