I'm kind of enamored with the sixteen, one of my goto coyote guns is a 1926 Drilling 2 1/2" 16 ga with 1 oz of NP BB's.
Rarely need to use the rifle barrel.
Most of my 16's have short chambers so I have a Mec 600 set up with a short shell kit, never in need of shells NP BB's and 2's for predator hunting, 3/4 oz ITX 6's for waterfowl and 7/8 oz lead 5's and NP 7's for upland.