The difference between the 375 H&H and the .375 Ruger are almost identical to the differences between the 300 H&H and the .300 Win Mag.
Alaskans are voting with their pocket books and the Ruger is currently outselling the ancient H&H by a wide margin and a number of astute African PH's are also discovering the benefits of the Ruger as well.
Phil-this is just me but I'll hazard a guess that it's more about the price point and the package than it is about the round. Thoughts?
Personally I like the package that the 77/375 Ruger has to offer but it's very hard for me to find a factory 375 that I'd even remotely consider toting as it comes from the factory. The 700 XCR is the only exception to this that I can think of.
Thx
Dober