Quote:
Originally Posted by John Mazza
[BTW: since the thinner walled muzzles of each barrels "touch" (at the muzzle end) - and the breech end of the barrels (which have much thicker walls) also touch, this means that the barrel centerlines are not parallel, and the paths of the shot charges must cross each other (when viewed from above the gun) not too far from the muzzle. Double rifles (when viewed from the muzzle) have the centerlines of each bore separated by a great distance in order to keep them reasonably parallel. Since shotgun bores do not appear to have the parallel centerline, that level of exactness must not be needed.]
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True, to an extent... however, keep in mind that when the barrels are joined at the breech the sides of the breech end are filed flat and brazed together with a combined wall thichness equal only to the chamber wall thickness of a single barrel which helps greatly in aligning the two bore center lines and aids greatly in regulating the barrels.