Length of choke run, contour or "ogive" (- what a goofy word!) of the choke, and presence or absence of keels and horizontal terminal rib striations are all completely moot until you pattern the gun. Keep in mind that different manufacturers assigned different values to the degree of constriction(s) that produced specified pattern densities at given ranges. (Essentially what Dean said). Winchester designated "Skeet 1/Skeet2) even among the 12, 16 and 20 gauge guns produced what other makers would call IC and MOD. Savage Fox Skeet and Upland Game Guns from the 1930s designated CYL and IC actually measure right at .005" and .011" - .014" constriction. FN Brownings and most modern Superposed Brownings built in Belgium measure .723" true barrel diameter at mid-bore in 12 gauge; when you wind up with a true muzzle diameter resulting in their designation of full choke, you are talking .040" constriction. So one size does not fit all.
|