This might be helpful, and includes a summary of Bell's study
http://parkerguns.org/forums/showthread.php?t=34360&page=2and
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=607809&page=1 https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=621506 I would emphasize that we have
NO modern pressure data regarding 16g and 20g long shells in short chambers.
Some 16g shells (of course after being fired) are shorter than the nominal 2 3/4"; esp. Fiocchi. Components change however and it might be worth doing some dumpster diving for 16g empties at the club and measuring those of different makers.
Winchester Super-X 16g 1 oz 1165 fps 2023
![[Linked Image from photos.smugmug.com]](https://photos.smugmug.com/Shotshells-and-pressures/Shotshells/i-8zxZRw6/0/LhLMJBqnTs28vMmDc2Q2xQN9thkxj3BnkBV5CXp7X/M/Winchester%20Super-X%2016g%201%20oz%201165%20fps%202023-M.jpg)
