I beg to differ.
not only there was a NFB proof (expressed in cordite and bullet grains), but there was a specific Kynoch and Eley line of ammo.
The loading was typically stiffer than true BPE with a bit heavier bullets and a bit faster velocity, although no where close to full nitro velocity.
For instance, the .500 3 1/4" was loaded around 440 grs at close to 1800 fps IIRC.
I guess the official name was "Light Cordite" rather than NFB and many of those rounds have LC stamped on the case.
Of course, this is not to be confused with the reduced "tropical" loads, which is a different story entirely.
In order to stay safe, stick with the proof load stamped on the gun.
If it only shows something like 450EX, you should only assume a regular BP load. Anything more would be an unsafe assumption.
Actually one of my pet peeve is auction descriptions routinely describing NE loads inappropriately for BPE guns. Better for gun values, but terrible for body parts...
Best regards,
WC-
