RE: Early season calling.
I have read in several places now that very, very light rattling could work at this time of year as well. The articles I've read say not to go nuts but just do a light 30 second sequence spaced out a minimum of every half hour. I guess it is not uncommon for bucks to already be sparring half-heartedly, getting ready for the real fights later on. Therefore, some light rattling might draw bucks in to participate or watch. I have not tried this myself, though. So I have no real experiences to share.