I'm in northern MN. Right now I haven't been out much, but I've been out MANY times this time of year and have had great luck rattlin' in bucks. Mind you, they aren't trophies, but regardless, the bucks came in!
I tickle the end of the antlers.... like if they are play sparring. I also may do a loud or semi-loud clang when I originally bump the antlers together and I will keep them together and grind them. There is no major separation of the antlers, just keep pushing, grinding an rolling them.
It's a bit early right now to simulate a full out fight, but the light tickling has worked great for me and I don't hesitate to do that this time of year. The does are curious also about what's going on and they can be called in too. LOL! I know this because I've been trophy hunting quite a bit and when I do this, I've passed up many a good buck for something bigger.
Stay safe buddy.
iSnipe