I posted a video from the class we did in a new thread.
I will look for it. I did rattle a 2X2 blacktail two years ago and killed it. 20 feet.. Snuck right up on me. I never knew he was there until I looked look over the log and saw his little antlers. It works on blacktails just don't let them sneak up on you.
Some barge in and some sneak in downwind, whether whitetail, mule deer or blacktail coming to a call sound. Be grateful for the bold ones that barge in but set up for the sneakers.

Three Nails is good at rattling and good at showing how he does it.