I say Mb are 18" and inside spread is 16" making it high 120's.
I've watched this sucker for hours through our kitchen window
I know he's wider than 16 inches. I'd go down to 18 inside, maybe. I have a buck on the wall with 22" and 25" main beams. I thought he was somewhere between the two. I'd go down to 22 inches on those as well. Here's a head-on of him. I think this is the same buck.