I've actually shot several deer walking and always had pretty good luck with it.I killed my biggest deer with my bow, a 131 7/8 inch 8 pt.,at a fairly fast paced walk. He was chasing a doe and I shot him ata distance of 7 yds. He ran less than 50 yds. and I watched him fall. All, but one of the deer that I've shot walking were less than 10 yds. when I released. I did shoot one last year at 34 yards walking. She had come in close and busted me when I went to draw. She made a few hops, and then slowed down to a fairly slow walk. I was already at full draw as she straddled a fallen over tree I had previously ranged at 34 yards and I shot. I double lunged her. She ran less than 40 yards. Looking back, I probably shouldn't have taken that shot, but in the moment, I did, and I got away with it. At close range I see no problem with it.It's just as high percentage of a shot as one standing stillup close.At over 20 yards, I think it's getting a little iffy. I always have hunted with the philosophy, that if it's a shot I'm comfortable with at the moment, I'll take it. I don't have specific angles, yardages, etc. that I will or won't shoot. If I'm confident in myself, to make that shot, at that time, I'll shoot. Of course, I'll always try to stop the deer first, but if it won't stop, and it's in a good opening, and I have time to get on it, it's going to have a bad day.