What is this type of the engraving called?

The scenes are almost certainly an actual photo or painting transcribed as an engraving.

How is it done? Hand engraved? Or dare I saw it, computer engraved? By some method?

The charging black rhino is absolutely from a black and white photo, possibly a video still.

The elephant engraving is also familiar, The elephant named something like "Mahorjob" comes to mind. A great tusker.

I really like the engravings on this rifle.

At Westley Richards I wonder at this rifles price.