I don't know much about it but is the gun steel proofed if so try what you like.
Mammoth steel 36g 3s as said above are really good in a 3inch. What chamber do you have ?
Standard steel is also fine with Gamebore 12G Super Steel in a 4 or 5. My mate does some great shots on ducks with them.
I am using Lyalvale Express Precision Steel 12Ga in a 5 and shooting well at the moment and use the mammoths for geese.
My gun is not steel proof but is a 3 inch magnum so I whack any thing through it