Guys,
Where did this term "Velopex" come from? Boddington's Safari Rifles has a picture from a H&H catalogue that refers to the 375Bore Holland "Velopex" magazine sporting rifle ... further down referred to as "New patent Velopex cartridge" in reference to the 400/375.

But I've also just found some reference to the 400/375H&H and 375 2 1/2" rimmed using a "velopex" projectile which included a wooden peg in its nose to assist expansion. The peg is claimed to be visible in some ammunition with large exposed lead nose, but hidden within the jacket in projectiles with lesser exposed lead. It seems to be a term used by H&H, signifies a lesser weight projectile with the peg, and seems to be limited to the 375 bore?

Any insights? Interested more for its historical info.
Cheers...
Con