Steel.
Size the target appropriately to equate at max, size of the kill zone of your quarry.
Helpful to have a dry, sandy berm behind it so you can spot your "misses". With a heavy recoiling magnum like this (more than the .300 win mag), a brake or can not only makes it more pleasant to shoot, but helps a great deal in getting the rifle to settle back on target in time for you to be able to do your own spotting.
Never used a camera, I'm sure they are helpful; but self-spotting can be done effectively without in most cases.
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