jig: 18.0 is .70866, or at least 15 points contriction for a standard European 12b which, at the time of production of your gun, was probably .724. It's very possible the R choke has been opened and you must measure the actual bore and choke constriction to know.

Last edited by revdocdrew; 10/31/07 03:43 PM.
https://sites.google.com/a/damascusknowledge.com/www/home