So is 375 H&H. I wouldn't worry about it unless the law specifies "375 H&H minimum" or your outfitter/PH says "no."
You need to be discriminating on your shot angle with both of them.
Or just step up to a 416 or 404 Jeff.
Yep. My own evolution path was to initially up gun from the ubiquitous .375 H&H to the romantic .416 Rigby. Perfect for Buffalo!
Then, as Elephant came into the realm of possibilities, I sold the .416 Rigby and up gunned to .470 double (Krieghoff) with the scoped Blaser R8 .375 H&H loaded with 350 gr solid as a backup.
Then, I carried the double for entire hunts for Elephant, Lion, Buffalo, with the R8 on the shoulder of one of the trackers, but I ended up always grabbing the scoped rifle for the shot as despite a number of close approaches at spitting distance in dense Jesse, all my shots (except one on Buffalo) came past 75 yards.
Note:
this does not mean that all shots on DG are past 75 yards, a fair number of them ARE in the 25 to 50 yards range, but that did not happen much in my own experience.
This, combined with the fact that because I shoot the R8 literally thousands of times per year with both .22 LR and .223 barrels, it has become "an extension of my arm", led me to make the decision to sell the double.
I now have a .458 Lott barrel for Elephant, Buffalo, and Hippo on land, and a .375 H&H barrel for Lion, Eland and Leopard (where mandated by law). All the rest is dealt with either .300 Wby or .257 Wby barrels. I have no issue shooting the Lott at 25 yards, or 5 yards if need be, with or without the scope, and my second shot from it is virtually as fast as my second shot from the double, as I am already reloaded by the time the gun comes down from recoil. Not to mention that shots #3 and 4 are light years faster with the R8 than with the double.
This being said, both .458 and .375 are too much gun for my wife, and she uses, as previously mentioned, a 9.3x62 barrel on her R8, with perfect satisfaction. I would not let her shoot with it an Elephant or Hippo on land alone without my .458 Lott backup, but I have no qualm whatsoever with her using it on Buffalo with 286 gr TSX.
This being said, as discussed I am getting progressively more uncomfortable with the nominal 5300 Joules energy requirement in Zimbabwe and 5,400 Joules in Namibia, and the nominal .375 caliber requirement in Botswana, Tanzania, Zambia, Central African Republic.
Thankfully neither South Africa (in most Provinces) nor Mozambique have minimum energy nor caliber requirements, so we focus on these countries for her DG hunts.
A few other countries also do not have these requirements, but I am not very excited about Benin, Burkina Faso, Ethiopia, etc.
Interestingly, Cameroon stands alone with a .354 caliber minimum requirement.
As a parting thought, I would say that all these regulations date back multiple decades, if not a century, and that they do not reflect the incredible improvements made in bullet technologies that have dramatically increased the lethality and reliability of calibers once considered marginal.