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My guess based on the size of the magazine housing is 3006, or a belted magnum like 300 win mag or 7 rem mag. It would be nice however if it was a medium bore like a 9.3 x62 or 375 h&h or even bigger...

In that case anyone thinking of grabbing one would be well advised to buy that 416 Rigby, your 7/08 isn't going to cut it and with angry scrub bulls there's no such thing as too much gun.