The choking is the difference in the inside diameter (I.D.) of the nominal bore and the inside diameter at the muzzle. So, the choke constriction is basically how much smaller (diametrically speaking) the muzzle I.D. is than the nominal bore I.D.
So, to have a smaller I.D., the barrel walls at the muzzle are thicker than the barrel walls a few inches down the barrels from the muzzle. (Dean was speaking "comparatively" about a tighter choked barrel, in that Q1, Q2 chokes will result in a thinner barrel wall at the muzzle, as compared to a tighter full choke...)
...just wanted to clarify.
John
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