In the Flynn article, file:///Z:/weber-old-web-2015/flynn/james_flynn_bss_sidelock_article_050104.htm

Mr. Flynn describes the chokes as Full/Mod but c'mon, I had no idea.
Massively Full choke with at 22 yards yielded a whopping 12 inch pattern.
A spreader disk provided a most wanting extra 2 inches.
7/8 oz of #9's at an incomer on either station 1 or 7 left nothing but vapor.