Now, I know this was whitetails, but last year in Idaho dad and I rattled in about ten bucks in a week. I got a nice three point that way.
I would rattle hard, crashing and banging them together for three to five minutes, then rest and grunt, resting for about three to five mins. Then I'd do it again, mixing between crashing rattling and tickling.
I plan on trying it for blacktails this year, we'll see how it goes.