Nunn by clear decision, for me. Puncher's chance for McCallum but he wasn't quite the same force at 160 as he'd been at 154. That's assuming we're taking both guys at their Middleweight best, of course. The McCallum who hammered Watson (his best showing at Middleweight) would have a much better chance against the uninspired Nunn who laboured against Barkley. But if we're talking the Nunn of the Tate fight then McCallum is going to struggle.