Posted by mark on June 12, 2016, 1:42 am, in reply to "Re: chokes"
Just checked the article and Jim is correct, M/F only. It does discuss unconventional choke configuration, being slightly flared at the muzzle. Tightest constriction was 1/2" in from the muzzle. Dimensions for the test gun used in the article were: R-.708, L-.692