.465 H&H Magnum

The cartridge is a necked-up, shoulder-lowered tapered cartridge based on the.378 Weatherby Magnum case.

• Name —.465 Holland & Holland Magnum • Origin — United Kingdom • Type — Rifle • Designer — Holland & Holland • Design Date — 2003 • Production Date — 2003–present • Parent —.378 Weatherby Magnum • Case Type — Belted, bottleneck • Bullet —.468 • Land —.459 • Neck —.494 • Shoulder —.531 • Base —.582 • Rim Dia —.579 • Rim Thick —.063 • Case Length — 2.894 • Length — 3.550 • Case Capacity — 134 • Primer — Large rifle, magnum • Max Pressure — 62366 • Bw1 — 480 • Btype1 — SP/Solid • Vel1 — 2375 • En1 — 6012

Holland & Holland began receiving requests from potential customers for a cartridge that would provide more power than the.375 H&H Magnum. Holland & Holland director Russell Wilkins undertook the project which culminated in the.400 H&H Magnum and the.465 H&H Magnum cartridge designs. The original design requirements called for a muzzle energy of over 6000 ftlbf. To meet this requirement Holland & Holland chose the.460 Weatherby Magnum case as a starting point in their design. This.465 H&H Magnum cartridge is not the same as the famous.500/465 Nitro Express also designed by Holland & Holland for "India" double rifles. The.500/465 Nitro Express is the only other cartridge with the same bullet diameter as the.465 H&H Magnum. Both cartridges are designed to fire a 480 gr.468 caliber (11.89 mm) bullet. Although the cartridge is capable of operating at rather high pressures, Holland & Holland chose to load the cartridge to a moderate pressure of around 47000 psi. Furthermore, the taper and shallow shoulder of the cartridge aids in the smooth, reliable feeding and extraction. The.465 H&H Magnum is an excellent cartridge for all-around game and African dangerous game including the Big 5. It has a similar trajectory to that of the.375 H&H Magnum. Ammunition for the.465 H&H Magnum is being manufactured by Wolfgang Romey for Holland & Holland.

Both.465 H&H Belted Magnum cartridge and chamber specifications were standardized by CIP on 2006-09-19. The.465 H&H Magnum is based on the.460 Weatherby Magnum case, itself based on the.378 Weatherby Magnum. The.378 Wea. Mag. was itself based on adding a belt to the.416 Rigby case & giving it a Weatherby double radius shoulder. Holland & Holland took the.460 Weatherby case and moved the shoulder back, creating a longer neck for the cartridge, and increased the body taper of the cartridge. The case is also necked up to accept a.465 caliber (11.65 mm) bullet.: • Illustration —.465 Holland & Holland Magnum cartridge dimensions – all dimensions in mm (in) •.465 Holland & Holland Magnum cartridge schematic: All dimensions in millimeters [inches]. Rifles chambered for the.465 H&H Magnum have a bore ∅ of 11.65 mm and a groove ∅ of 11.87 mm. Twist rate for rifles can range from one revolution in 406 mm to 711 mm. The maximum average pressure suggested for the cartridge is 4300 bar.