Mr. Boyd makes a good point. The Arrieta 2" guns were as heavy as a lot of Brit 2 1/2" guns, and a good bit heavier than Brit 2" guns. What you get from a 2" is essentially the shot charge of a heavy 28ga or a light 20ga. And it's far easier to buy 28ga or 20ga shells, and easier still to reload them, than it is 2" 12's.