From what Nitro, Bakes, and 470 have said, the water buffs have been running in Oz for quite a while. Go to Nitro X's post on hunting buffs in Oz.

RD, I never bothered to load the 458 down as it was soft enough for me shoot all day with it. The only concession was to load a 600 gr cast bullet to check whether it would do anything. It had decent penetration but I had to seat it out a bit as it definitely ate up cartridge space.