The .375 Holland & Holland Magnum is a medium-bore rifle cartridge. The .375 H&H was only the second cartridge ever to feature a belt, now common among magnum rounds. The belt is for headspace, due to the narrow shoulder. The belt replaced the rim in function on these new rimless cartridges. It was introduced by the British company Holland & Holland in 1912 as the .375 Belted Rimless Nitro-Express. It initially used cordite propellant which was made in long strands – hence the tapered shape of this cartridge, which was also to ensure smooth chambering and extraction from a rifle's breech.