The .465 H&H Magnum also known as .465 Holland & Holland Magnum, is a modern big bore firearms cartridge. It was introduced by Holland & Holland in 2003 together with the .400 H&H Magnum. The .465 H&H Magnum is a .468 caliber, belted, bottleneck cartridge. The cartridge is a necked-up, shoulder-lowered tapered cartridge based on the .378 Weatherby Magnum case.
General information 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 . 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 .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 . 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.
Specifications 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.
.465 Holland & Holland Magnum cartridge schematic: All dimensions in millimeters [inches].
Rifles chambered for the .465 H&H Magnum have a bore ∅ of and a groove ∅ of . Twist rate for rifles can range from one revolution in to . The maximum average pressure suggested for the cartridge is .
See also Table of handgun and rifle cartridges
References