My particular Type 33A has caused a lot of head scratching for me, and others familiar with these guns too! So it's still a bit of a mystery! I even wondered if someone at Husqvarna put a standard 9.5 barrel on it, but reamed the chamber for a 9.3 instead?
I'm actually tickled to death that it is what it is as it shoots exceptionally well, and is so cheap, simple, and easy to make ammo for. But seems it will always be a mystery as to how it got the chamber it has.