I am a meat hunter primarily so this would not be a shot that I would take unless it were a head shot. I hate to work on a gut shot animal of any kind and in order to avoid the head or mount, a boiler shot maybe 8" below the shoulders would be the only alternative. But, a head shot would certainly be an option for me, as the mount is not something that I would be interested in anyway.
I would wait for the shot. He is feeding and unalerted so waiting would not be a problem. I would probably have to put him on the wall.