Gevelot all-aluminium shotshell

What is the purpose of the cannelure on the body?

Hds is METAL BREVETE cal.16 N

without any warranty from the government

you find that when it is a patent


Thanks JP,
do you have any idea about the cannelure on the case?According to me it should stop the wad and the shot inside the case but the other all aluminium or brass shotshells I have don’t have this cannelure

Bonjour Pivi
you are right, it is to stop the wad
some other aluminium cases don’t have such cannelure but have a renforced cup inside the base you don’t see from outside

we can say that (brass or aluminium) cases have or have not a renforced cup at the bottom, all depending of the thickness of the wall at the bottom