John, regarding my statement that a gun with shortened barrels having a tendency to shoot high; The line of the center of the bore is, as you say, a straight line that cannot be altered.... but the shooter's line of sight (also a straight line which cannot be altered) is aligned in direct relation to the center line of the bores and the aid in this alignment is the plane of the top rib with a bead set upon it as a further aid in aligning the shooter's line of vision relative to the center line of the bores. When the barrels are shortened the rib, of course is shortened also, altering the aid to alignment of the two straight lines that the shooter is dependant upon. Now as the shooter maintains his straight line of vision along the shorter rib and the bead the angle of the center line of the bores has been altered upward a bit at the end of the barrels. There is no helping this if the shooter is to shoot as he has always done, i.e. using the rib and bead as his only aid in aligning the center line of the bores with his intended target. This will be more pronounced in smaller gauge guns on larger frames, e.g. a 28 ga. on a 0-frame or a 16 ga. on a 2-frame or a 12 ga. gun on a 3-frame with cut barrels.
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