Lancaster,
I am a cartridge collector but I don't have a 32 mm shotshell sample.
However I think that it was used on punt guns.
You can download the 1926 Fiocchi catalog here:

http://www.armietiro.it/edisport/armi/No...69?OpenDocument

( it is free)

Later I will post the picture of my 11,2 x 72 Schuler cartridge sample