.465 H&H Magnum
{{more footnotes needed|date=September 2014}}
{{Notability|Product|date=June 2023}}
{{infobox firearm cartridge
|name= .465 Holland & Holland Magnum
|image=
|caption=
|origin= United Kingdom
|type= Rifle
|service=
|used_by=
|wars=
|designer= Holland & Holland
|design_date=2003
|manufacturer=
|production_date=2003–present
|number=
|variants=
|is_SI_specs=
|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
|rifling=
|primer= Large rifle, magnum
|max_pressure=62366
|max_cup=
|filling=
|filling_weight=
|detonation=
|yield=
|is_SI_ballistics=
|bwunit=
|bw1=480
|btype1=SP/Solid
|vel1=2375
|en1=6012
|bw2=
|btype2=
|vel2=
|en2=
|bw3=
|btype3=
|vel3=
|en3=
|bw4=
|btype4=
|vel4=
|en4=
|bw5=
|btype5=
|vel5=
|en5=
|test_barrel_length=
|balsrc=
}}
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 {{convert|6000|ftlbf|J|abbr=on}}. To meet this requirement Holland & Holland chose the .460 Weatherby Magnum case as a starting point in their design.{{cite book | last = Barnes | first = Frank C. | editor = Skinner, Stan | title = Cartridges of the World | edition = 11th | origyear = 1965 | year = 2006 | publisher = Gun Digest Books | page = 400 | isbn = 0-89689-297-2}}
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 {{convert|480|gr|adj=on}} .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 {{convert|47000|psi|bar|abbr=on}}. Furthermore, the taper and shallow shoulder of the cartridge aids in the smooth, reliable feeding and extraction.{{cite web|last=Hawks|first=Chuck|title=First Look: The .465 H&H Magnum Belted Rimless|url=http://www.chuckhawks.com/465_HHMag.htm|work=Chuck Hawks|accessdate=25 August 2010}}
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.{{Cite web|url=http://www.cip-bobp.org/homologation/en/tdcc_public?page=2&cartridge_type_id=3|title=CIP - Homologation|website=www.cip-bobp.org|access-date=2016-10-16|archive-url=https://web.archive.org/web/20161019041630/http://www.cip-bobp.org/homologation/en/tdcc_public?page=2&cartridge_type_id=3|archive-date=2016-10-19|url-status=dead}}{{Cite web|url=http://www.cip-bobp.org/homologation/uploads/tdcc/tab-iii/tabiiical-en-page38.pdf|title=C.I.P. drawing for 465 H&H Belt. Mag.|last=|first=|date=|website=|publisher=|access-date=}}
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.
:Image:465Holland&HollandMagnum01.png
:.465 Holland & Holland Magnum cartridge schematic: All dimensions in millimeters [inches].
Rifles chambered for the .465 H&H Magnum have a bore ∅ of {{convert|11.65|mm|in|abbr=on}} and a groove ∅ of {{convert|11.87|mm|in|abbr=on}}. Twist rate for rifles can range from one revolution in {{convert|406|mm|in|abbr=on}} to {{convert|711|mm|in|abbr=on}}. The maximum average pressure suggested for the cartridge is {{convert|4300|bar|psi|abbr=on}}.
See also
References
{{Reflist}}
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Category:Pistol and rifle cartridges