I liked the statement further down that goes
"The 2 bore would need a 1.325" bore diameter for a half-pound round ball, but that makes for a barrel of about 30 pounds, according to length, so conical bullets are used and the bore diameter is 1.052", which is actually true 4 bore size. Confused yet? Of course, this also lets you shoot true 4 bore round balls as a light load in the 2 bore if you want. That’s the first time a 4 bore, which has 300 foot pounds of recoil in a standard 4 bore rifle, has ever been called a light load."
Or "Sea captains should note that a smooth-bore 2 bore will also handle a mammoth load of buckshot capable of sweeping the deck clean of Somali pirates, assuming you did not sink their craft with 2 bore slugs before they got that far."...
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