Buy it, and shoot it! Shoot it heaps!

Modern loads for the .375 NE will be lower pressure than the original cordite loads by a fair margin I expect, especially if you ever use it in the tropics.

Today we have better bullets, better brass, better primers, and much better powders. Blaze away!

...and don't be shy about posting photos when you take delivery. Many of us here are Lee Speed addicts!

In an effort to encourage you further, here's a pic of a few Brit sporters from my gunsafe,
on display at the Royal Darwin Show last year:

Army & Navy Lee Speed (BSA No.1 Pattern)
Army & Navy Martini Enfield
BSA Lee Speed No.3 Pattern
BSA Lee Speed No.3 Pattern w/ heavy barrel
Churchill SMLE No.1 Mk.III sporter