Does anybody have experiences or info they can share about the 360 Rimless Westley Richards cartridge?

What rifles was it chambered in, case dimensions, loads.....

From what I can gather it's the 400/360 NE (2 3/4") Westley Richards case with the rim turned off and an extractor groove cut for use in a Mauser bolt gun with a 30-06 sized bolt face.

COAL = 3.6" (so it needs a magnum length action)
Case length = 2.75" (same as the 350 Rigby's)
Bullet Dia = .358"
Shoulder dia .437" steps down to Neck dia .375" so should be enough for head spacing a rimless case in a bolt gun.
Don't know the shoulder angle.

Looks like cases could be made by modifying a 9.3x74R case. Can anyone confirm these dimensions are correct?