Originally Posted by Sam_H
Originally Posted by Kurt52
.....26" modified choke barrel that mikes out at .009" of constriction. Not sure if the choke was opened up or came from the factory that open.

Quite possibly original. WW's pre-64 mod will usually have less constriction vs Briley's 0.015" spec. Helps to know bore diameter as well as terminal constriction diameter - not just net constriction - and whether there's a long parallel extending to muzzle.

Sam, Just spent a few minutes measuring the 88 year-old Model 12 20 ga that is stamped Modified. The choke constricts down to 0.607" about .8" from the muzzle and is parallel out to the muzzle. The OD of barrel at the choke parallel section is .704". The barrel ID 3.5" in from the muzzle is .615" and .617" 3.5" in from the chamber end (with the barrel off the action). Averaging the barrel ID in 3.5" from each end gives me .616" ID and .009" of choke constriction. For my uses for a 20 ga it is perfection for all around use with 7/8 oz loads. Kurt

Last edited by Kurt52; 02/04/23.