Well within range.He's alert.... maybe heard your last step or smells you a bit as wind is swirling.He will either stand up giving you a better body shot....which is what I would wait for...or he'll bolt up and start running.I would never take the neck shot as I hate those.If he turned his head the opposite way you would have a nice shoulder shot.
I concur with the previous posts. Now is not the time to panic, but to freeze. Keep an eye on his ears, they are searching for the sound he just heard, if you move too much he will zero in on you instantly. Wait for him to relax. When he is not looking at or near you, slowly and quietly get ready for a shot once he stands and presents the vitals better. Just try to keep the sound of your heartbeat from scaring him into the neighbours bush! :recon:
I've never used muzzle loader but with a rifle I would take a neck shot on this from 85 yards... at least if he seemed at all agitated. If he seemed COMPLETELY unaware of me I would probably find a good rest and wait for him to stand, but from 85 yards this seems like an easy neck shot.
After viewing this picture again I decided I would wait and not take the shot...... cause..........I look the way he's looking and here comes a GIANT double drop tine non typical that would score in the low 300 inches and totaly unaware of me standing there.....yep...... thats what I'd do........