the Romey cartridge is loaded with wooleigh bullets in Horneber brass with a CIP proof. It will be the same ammo but with different headstamp like Holland & Holland have . no doubt, Romey load the the ammo like he do for Westley Richards. Horneber make the brass for him with every headstamp he need and there will be no other difference between. I wonder if H&H sell the ammo for much higher price so nobody can say it is a very exclusive cartridge.