100 yds is probably as close to a bedding area as you should try to get and you will have to be very careful to only hunt that stand with a good wind blowing away from the bedding area. If you hunt that stand on a bad wind and it blows your scent into the bedding area you not only will be done for that hunt but with mature bucks you will most likely be done with any bucks using that bedding area for the rest of the season unless you get a chance at them during the rut when they throw caution to the wind.