We are heading for an almost 20 year old answer to a question noone asked. I just fail to see what the round brings to the table for which a place has already been set.
The 375 H&H was, and remains, an excellent cartridge. But there are few man made objects Orr tools that can not be improved upon.
Being designed for temperature sensitive Cordite powder the old H&H round is long, belted and severally tapered to assist with extraction in hot climates.
The 375 Ruger does not face those constraints as we have modern temperature insensitive powders, the belt is unnecessary so a shorter case with less taper will allow equal, actually a bit more, powder capacity.
The shorter case means it easily fits in less expensive standard length actions .
A shorter case means little to most people but if you use your rifle on dangerous game the ability to operate the bolt even a tiny fraction of a second faster can be a lifesaver . That’s why many PH’s prefer double barrel rifles.
A fraction of a second may not seem like much when you are at the range, but anyone who ever played , or watches sports, will tell you that the difference between being the fastest by even a nanosecond can separate the top boxer, batter, soccer player, sprinter or NFL lineman from winning or loosing . And when your life in on the line you want every advantage you can get
