My mistake... I remember now.

I guess it is true that a rifle projectile has much more "grip" in the bore than a shotgun charge thus its tendancy to push the barrels off face is greater. Perhaps soldering lumps into shotgun barrels could be seen as sufficient when the same would not be prudent in a DR.

Still, given the strength of soldered joints these days, and the surface area of barrels mated to a monoblock, I would be interested to see a study of a barrel chambered in a lower pressur cartridge assembled in this way. I bet it would work. It may be helpful in regulating too since the solder could be heated and the barrels rotated within the block to get the barrels to converge - two overlapping circles cross at two points. Think of your barrel (right or left) shooting in a circle as it is rotated on a fixed axis (at the breech).

Huvius