I have taken animals as small as duiker and up to eland and hippo...with a .300 RUM in an HS Precision rifle..using 200gr A-Frames..

Would not be afraid to hunt anything on the planet with it with the exception of elephant..and I am sure it would work just fine on them as well if it were legal...

Just read recently in a magazine the .300 magnums has actually grown in popularity in the last 10 years