The .375 Ruger is an improvement versus the .375 H&H for all the reasons elucidated above.
Similarly, shorter bolt throw honors go to the .458 WinMag as an improvement over the .458 Lott.
New powders and new bullets make the SAAMI .458 WinMag the clear winner, disproving all of the Lottite denials.
Single-load it to same greater MAP and COL as the .458 Lott for stunt shooting, and it outruns the Lott.
Keep a magazine full of premium bullets for short-range, quick follow-up work with the .458 WinMag.
Unfortunately the .458/.375 Ruger is not an improvement over the .458/.375 H&H 2.5".

Ron aka "Rip" for Riflecrank Internationale Permanente
NRA Life Benefactor and Beneficiary
.458 Winchester Magnum, Magnanimous in Victory
THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.