Personally, I do not see what the attraction is for having a 375 round in a nonmagnum receiver...

Sure the gun will be lighter, but the recoil is greater...

There are time to go fast and times to go moderately fast...in Africa, Moderately fast gets it done...Mine were loaded to 2550 in both soft and solid and did the job well...

I doubt if the 400H&H and the 465 H&H will get off the ground very far in the US...the 400 has a less desirable size of .411 instead of the popular .416 and the cost of components will be high...If you want a bolt 465H&H...the question is why...there are lots of 458 caliber bolt guns that get the job done in good fashion...the 458 Win, the 458 Lott, and lots more...

Let us know what you find at Empire..