I live in MD and this past weekend was our early muzzleloader season and the amount of shooting was way off. The only few deer I seen and the one my son killed were all after 9am so Id have to agree with the later movement theory. One of the deer seen was a really nice 10pt that bedded along the field edge for only about 15mins and was back on his feet and moving again at 945am. I got to my stand early both days about 45mins prior to legal shooting light and was covered up in deer both days but as soon as it became 10 mins or so away from being able to see to shoot they migrated away and didnt see anything again until after 9am. Id say go in late and leave early.