One of my PH buddies in South Africa, Rob Klemp, also owns a big sporting goods store in Kimberley. I did a magazine article a couple years ago about how the .375 H&H is doing in the 21st century, and as part of the research e-mailed him. He said that while African hunters still tend to prefer the H&H (both because they're traditionalists and because used rifles cost far less over there than new, imported rifles in .375 Ruger), he'd been stocking .375 Ruger ammo for a while because the demand was increasing.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck