Yeah Daryl, compared to that 2 bore they all look small.
I had a guy in the shop when I was working on the 2. He was bragging about his 460 Weatherby. I told him I could use the 460 as a ram rod to load the 2 bore, and he laughed.

When I showed him that I could, he stopped laughing.

The 2 bore would almost let a golf ball in. If I had whacked it with a mallet that golf ball would have gone into the bore.

All in all I prefer a good 62 or 66 cal for my "All around north American gun".
If I were never to shoot moose, big bears or buffalo I would be just as happy with a 58 cal.
Still there is something to be said for a 12 bore. Millions of hunters go afield every year with 12 gauge shotguns after white tails. You need not load for hippo or elephant. A 12 with 90 grains of powder will be a white tails worst nightmare within 75 yards, and will not kick very hard.

It's funny how the shotgun manufacturers all are going to "slug barrels" with rifling these days and saying it's new and improved. Well they are improved, in that they do shoot slugs way better than a smooth bore at longer ranges, but they are now "new". They are just coming back to technology that has been around for 250 years.