I don't have the Kodiak, but will happily pick one up when I find one at the right price and have the money in hand.
I do shoot a lot of 58 caliber (I have four 58 caliber rifles), and I know a couple of folks with 58 caliber Kodiaks. They use approximately the same loads I do, so my experience may be useful to you.
It's a potent round if you want to stoke it up. It's my choice for moose and elk, though I'm yet to get around to them. At lower charges, it still works fine for deer. I'm currently shooting 80-100 grains of Goex 3f through mine, and my hunting pard is using 90 grains of 3f triple seven in his two rifles. Friends with the Kodiaks use something similar for "all around shooting." A .570 ball and lubed pillow ticking patch is likely to be just right in yours.
One friend with the 58 Kodiak reports great happiness with conical bullets in his on as much as 120 grains of 2f Goex. He's shooting several different conicals, and I don't remember the particulars. I know one is the Lee REAL weighing in at 440 grains, as I recall. My rifles really like it too. I do recall that he's wrapping his in teflon tape to increase the diameter slightly and help prevent the second conical from being moved when he fires off the first barrel.
In your part of the world I bet that 58 Kodiak would be the ideal pig rifle. In fact, if I lived in your part of the world I wouldn't be waiting for money or the right price to pick one up. Slap plastic and pay later, but get it in the house now!
I think you'll be really happy with your purchase, bot for fun shooting and for hunting.