Yep, must be some AP in there. Hope you can find a way to reliably differentiate them before your targets look like Swiss cheese!
I had some ADI .303 British ammo years ago. The seller told me it was armor-piercing before I bought it so I was not surprised at that, but I was surprised that there was no paint codes on the bullets like the US and many other countries used. All my ammo looked just like a FMJ too.
I recall that ammo was loaded HOT too -- those Aussies don't fool around!
John
