Hello,

Agree about the 9,3x62 is not a .375 H&H. But neither the 9,3x64 is a .375 H&H.
One thing is to compare factory loadings, valid for non reloaders, and other thing is to compare handloads of this three. To make a valid comparison, is necessary to use same barrel lengths and pressures. All these three cartridges, in modern guns, can be reloaded at the same maximum SAFE pressure not matter the factory standards for them. The 9,3x62 has around 74 grs of case capacity, the 9,3x64 84 grs and the .375 H&H 94 grs. This differences show, clearly, that there are no way to obtain same performance between them without use more or less pressures and or more or less barrel lengths.

Best!

PH