4seventy ,you are quite correct, the method is applicable to any double rifle. The differences in the H&H system from most is their use of heated IRONS placed in the barrels, turning the barrels themselves into soldering irons. This is better, IMO, because it give a more uniform heating around the diameter of the barrel, and doesn't heat one side of the barrel hotter than the other, as useing a torch does. Less potentual for warpage! Additional is the use of stainless wire wrap to hold the convergance, while tweeking the barrels so they both shoot to the same elevation, is something not many use. Most use elaborate fixtures. The wedge design is also better in the H&H than others, as you say, but requires more work to do.

All I was saying, or trying to say is, there is more than one way to skin a cat, and this book only shows one, but I consider it to be the best system!