I rattled in my first archery Blacktail a few years ago. He was a nice 3x3 running across my viewpoint from my tree stand. He was about 80-90 yards away. I rattled hard for 30 seconds and he stopped in his tracks and looped around looking for me. Ten minutes later he got arrowed at about ten yards.
Since then I have not had absolute proof that rattling works. I still believe in it and do it though. Good luck!
SR1