hoppdoc
The reason so many people carry a shot gun is that they are inexpensive.

A big calibre double would be a much better choice... But they are just to expensive.

I would prefer a 45/70 Marlin Guide gun to any shotgun.
I have shot deer and pigs with a slug... same animals with a 45/70.
I would much prefer the Marlin, while not as good as a double it is affordable for anyone who values their hide.
I would also carry a 44 mag revolver if legal,[it is not in Canada for example].