Craig: as you know that statement was based on a study of 12g shells
https://docs.google.com/document/d/1...A/edit?tab=t.0
We have
NO data regarding using long for chamber 16g or 20g shells.
Again, some modern nominally 2 3/4" shells are shorter than 2 3/4". It was recently reported that Aguila 16s were short
https://trueshotammo.com/ammunition/...1-oz-1200-fps/