How about a .500 S&W Pumper?
Just not a fan of the end cap thing for the barrel/magazine tube, and that the mag tube/barrel are fairly far apart.
I'm not sure of these (.45 ACP, .50 AE, .500 S&W Pump) guns could ever be taken for a serious hunting rifle. But for something pretty darned different, its certainly up there in caliber choices. Like.. Imagine a 5-6lb .45 ACP lever, 16" barrel, holds 11+1, for a rabbit gun. .50 AE, same barrel length, 16" barrel, 6 + 1 capacity, one fun anything in Aus/most of US gun. .500 S&W Pump, think it said it holds 5+1 good for pretty much anything on most continents, the big grey fellas in Africa exempt of course. Just fun little thoughts.

Heres the "Predator Tactical" .500 S&W Pump, i also see theres a companay manufacuturing a lever gun in .500.