I have read of Alaskan guides who carry a Mag10 or a 12ga pump with Brenneke slugs [I know you'd approve, MSP Ret!]
And, I'm sorry, but I recommended to my son, who was to be stationed in AK, that he get an 870 or 590 short barrel for slugs.
Not an auto, but a pump.
IF you need that 2nd shot, you do want it to be there.