Just read with interest Buchsemann's post on his success with 16-bore Brenneke slugs, and figured the following info might be worth tossing up. Thought about posting it in 'Shotguns' but 'Bore Guns' is perhaps more appropriate given the circumstances. With your kind indulgence...

In Australia, Brenneke slugs are harder to find than rocking-horse sh!t at the best of times, so during the great Brenneke drought of the 'naughties' we explored the available alternatives. The RC4 'Evolution' Palla slugs were an unmitigated disaster in the hunting field, however by contrast the Rio 'Royale' Balla Blindada slugs were highly successful.

Here is a full-grown buffalo cow taken for meat with a single Bala Blindada slug.

I tossed the story up on the Marrakai domain some time back, but never linked it through to the Hunting page.
You can read it here if interested.

Sadly, the Rio slugs are now just as hard to find as the Brenneke Originals it would seem. My attempt to order in a 'flat' of cartridges was eventually unsuccessful and I am now down to the last box! ...which I am stupidly saving for some illogical reason. Our importing agents are seemingly not interested in anything that cannot be mass-marketed for maximum profit. Grrrr!!