Dakor, the brain of a Rhino is very small relative to the size of the animal - and it's protected behind a very thick skull. The elephant brain is not easily hit from the front at all - it's also a relatively small target - about 8" diameter. It doesn't offer an easy shot when the animal is amost on top of you. At the time of that 10bore brochure, there were NO .375s or .416s - it's from the H&H catalog of 1910-1912! [img]images/icons/wink.gif[/img]
The hunters of that era only had the .577s in a true big game caliber. The smaller calibers were basically just Express Nitro loads of old black powder rounds... I think we can learn a great deal by reading the old books by people like Sir Samuel Baker and others who went out there and killed countless Elephant, Tiger, Rhino, Lion, etc.
One thing that Baker wrote has stuck with me - and that's his comment that some hunters harbor a bit of "contempt" for the game which they hunt and don't use adequate guns for the task. They have nobody but themselves to blame when the animal turns the tables on them - and then, it's too late... A BIG Grizz is nothing to play around with - even average Grizzly are bad enough to kill you and eat you.
This said, the Ol' .577 Express did sling a very heavy 650gr solid slug at 1950fps! I think the new Dixie Slugs' hard cast PREDATOR 12ga (full bore) slug can be loaded to nearly this same velocity with modern components.
I wouldn't leave home without that big .375! [img]images/icons/wink.gif[/img]
GOOD LUCK & STAY SAFE IN ALASKA!