.300 H & H Mag. Load Data

The .300 H & H Magnum, also known as the .300 Holland & Holland Magnum, is a classic rifle cartridge with a distinguished heritage dating back to the British gunmaker Holland & Holland in 1925. Designed originally for long-range hunting and competition shooting, the .300 H & H Magnum quickly gained a reputation for its remarkable power and accuracy. It was based on the larger .375 H & H Magnum case, necked down to accept .308-inch bullets, and featured the signature belted, tapered case designed to assure reliable feeding and extraction—a critical advantage for both dangerous game and competitive environments. When introduced, it became a favorite among international shooters, and its notoriety only grew following victories at several major long-range shooting competitions, including the historic 1935 Wimbledon Cup at Camp Perry. Its performance led to widespread adoption, especially before newer magnums entered the market.

In terms of applications, the .300 H & H Magnum stands out as a versatile option for big game hunters and long-range shooting enthusiasts. Its relatively high muzzle velocity and flat trajectory made it a favorite among professional hunters seeking to ethically take large and sometimes dangerous game at extended distances. The cartridge has been used for everything from North American elk, moose, and bear, to Africa’s plains game such as kudu, wildebeest, and sable. Even though more recent magnums, such as the .300 Winchester Magnum, have somewhat overshadowed it, the .300 H & H Magnum remains respected among reloaders who appreciate smooth feeding and reliability, especially in controlled-feed rifles and classic bolt actions. For reloaders, the spacious case offers ample flexibility for tailoring performance to specific field needs, making it both nostalgic and fully relevant today.

When considering target species, the .300 H & H Magnum’s capabilities make it suitable for most medium to large game worldwide. With correct bullet selection, it is equally at home in North America, Africa, and Europe, offering sufficient energy for clean shots on animals such as elk, caribou, red stag, and the smaller African antelope species. It excels when penetration and energy retention are necessary, but also offers precision for smaller game or long-range, varmint scenarios with lighter bullet loadings. Its relatively modest recoil compared to modern ultra-magnums also makes it a comfortable option for shooters who want magnum performance without extreme punishment. This adaptability is a key reason the cartridge remains relevant among experienced reloaders.

Typical bullet weights for the .300 H & H Magnum range from 150 to 220 grains, accommodating a wide spectrum of hunting and shooting scenarios. Commonly, 180-grain and 200-grain bullets are favored for general big game hunting due to their balance of velocity, energy, and ballistic performance, while lighter options are available for flatter shooting and varmint work. The long, tapered case design, while somewhat outdated by modern standards, provides smooth feeding—especially important when fast follow-up shots are needed. With its generous case capacity, reloaders can experiment with a variety of powders and seating depths to optimize accuracy and velocity for specific rifle-barrel combinations. Ballistically, the .300 H & H Magnum provides a good balance of velocity and manageable recoil, producing impressive long-range trajectory and energy on target, which established its legacy and explains its enduring appeal among precision reloaders and classic rifle aficionados alike.