I'll be going after hippo in 2020 along the Zambezi River. I've seen several nice rifles for sale on here, but haven't decided which caliber to get. Any recommendations as which caliber is best: .375, .416 or .458? The shot could be at a hippo in the water or on land. I'll be taking my 30-06 along for PG: gemsbuck, blue wildebeest, warthog, jackal and baboon.