The big boys tend to love the thickest, nastiest areas for their beds. Post season when the leaves are down , snow is piling up and it's downright nasty weather is a great time to find those beds. I have a meandering ridgeline that overlooks a heavily reeded swampland far below. I slowly walk that ridgeline and do a lot of glassing that swamp land. I'll do some calls and glass a suspected bed simultaneously. You'd be suprised at how many times I got a big guys attention. It's kinda like chuck hunting. My dad used to take me and once we were situated he'd give a high pitched whistle or two. Chucks head would pop up investigating. Bucks the same, but you have to have glasses on those suspect spots constantly. They're usually so danged thick you have got to be able to spot those slight movements. Good luck in your scouting. Find their beds and work back from there to watering holes, feed lots,etc.