Been rattling blacktail bucks since 1985. I use a big set(130-140 4pt class buck) of rattlers...but I started out with a smaller set way back when.
Patience and confidence are the biggest factors in rattling blacktail bucks!
I start out with a loud crack and and rattle aggressively for 45-60 seconds. Then I wait at least 5 minutes, followed by another 20-30 seconds of rattling. Quite often a buck will be coming toward the sound after the first sequence and might be close when you start the second rattling sequence. I've had many bucks come charging in during the second sequence and catch me rattling.
If I'm in a sweet spot with lots of buck sign, then I'll continue to rattle for 30-35 minutes before moving a quarter mile or so.
I don't rake brush or stomp the ground anymore, those bucks are keyed in on the sound of the antlers.
Some guys go out HOPING to rattle a blacktail, I go out expecting to rattle in a blacktail.
I rattled in this buck a few years ago...