Thread: 1oz slugs

I was given couple boxes of shotgun ammo, some of it turned out to be loaded with 1oz saboted expanding slugs.
These rounds seems to be very lethal, but I only used shots so far so I have no idea where can be these ones used. I heard somewhere that sabotted rounds are illegal in nz.
I'm thinking to pull them all and use the primers and the powders and load them with shots unless someone come up with a better idea here.
I already pulled one to see what is exactly inside, but the crimping is very hard to undo