I use "bore" when referring to British guns and gauge for all others. If that's what the makers called it, it's good enough for me.
Rob-
I can buy that--in English made (or market) shotguns, why not keep the flavor of the country of origin?
Language is evolving and who is to say that we will not abandon the term gauge for bore or allow it as an easy way for us to distinguish between a double shotgun and other types while at the same time convey the gauge? However, I will continue to call shotguns by gauge, no matter where they are from, because that is what I learned.
As for your observation regarding the country of origin use, I do agree to call a Parker, LC Smith, Fox, Winchester or Browning made in or for the US a "bore" seems particularly out of place.
The side by side is every bit as much an American classic as it is an English one and I while don't think it necessarily degrades a Fox to call it a 12 bore (if anything it is an effort to put the gun on a common footing), it nonetheless doesn't seem right because it is almost as if in order to get the firearm any respect, it must be referred to as a "bore". Take a look at the guns for sale and see how many sellers use the term "bore" for their American made/marketed double guns and you will see what I mean.
I wonder how many would refer to Winchester Mod 12s as a 12, 16 or 20 bore? I bet not nearly as many as those speaking of doubles.
Kurt- I also have trouble getting the "a" before the "u" when I type the word gauge (in fact I did so in my title to this post and had to edit it!)...don't know why that is. Gauge is often abbreviated Ga., so that might help.
Does anyone know the history of these two terms, and if there was ever a past common usage?
Doug