I turned my nose up at the 303 British for quite a few years. Then I bought a Longbranch number 4 mk1 that shot shot like a house on fire.
I sold it like an idiot, but I have a distinct respect for the cartridge.
I carried it hunting deer for a season or two before I sold it. THe truth is, I had complete confidence in the cartridge.
Anything a 308 can do in the game fields, the 303 can do as well.