Going back to the original post, of all the cartridges you listed, I'd say 308 is the only one really suitable for an all-round rifle for most game, unless you are planning on all shots being closer than 200m. If you are buying ammo rather than loading, that does limit your options for versatility, but 308 will knock over anything you want to shoot, as will alot of other calibres. But 243 (6mm) might be a bit small for some longer range hunting?
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