Jim
Not sure I agree, if you think of the width of the tubes at the muzzle vs the breach a straight line down the bores would cross shortly after exiting the tubes. I think the "magic" is that they shoot close together at the 30 to 60 yard distance. I know that Oscar used to take great care to replace the packing in Parker barrels at the same spot it came from originally and that he also was very careful in the allignment of the end of the tubes. I think there is some regulating going on with a side by side but not to the extream of a side by side rifle.
bill
