Unless you plan on shooting geese, bear or armored personnel carriers, magnum loads are unneccessary and generally not the way you want to go.
Current combat loads for shotguns are typically reduced recoil. They group/pattern better, further, kick less and the 100fps less is rarely noticed by the target.
I'd have absolutely no problem with a nonmagnum Wingmaster for a defense gun. I've had a 3.5" chambered Benelli and never, ever used the extra case length.
"And Shepherds we shall be. For thee, my Lord for thee. Power hath descended forth from thy hand, that our feet may swiftly carry out thy command. So we shall flow a river forth to thee and teeming with souls shall it ever be. In nomine Patris, et fili, et Spiritus Sancti. Amen."