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((short description|Rifle cartridge))
((refimprove|date=December 2011))
((Infobox firearm cartridge
| name = .450 Bushmaster
| image = 450 BM + 223.jpg | image_size = 200px
| caption = .450 Bushmaster (left), [[.223 Remington]] (right)
| origin = United States
| type = Rifle
<!-- Production history -->
| designer = LeMAG Firearms LLC
| design_date = 2007<ref>((Cite web|url=http://www.bushmaster.com/|title=Bushmaster - Welcome to Bushmaster Firearms International|date=28 November 2007|archive-url=https://web.archive.org/web/20071128083606/http://www.bushmaster.com/|access-date=12 November 2021|archive-date=2007-11-28))</ref>
| production_date = 2009–present<ref>GUNSweek. (2021, October 30). Bushmaster firearms reintroduces the 450 bushmaster Rifle. GUNSweek.com. Retrieved May 5, 2023, from https://www.gunsweek.com/en/rifles/news/bushmaster-firearms-reintroduces-450-bushmaster-rifle</ref> 
| manufacturer = Bushmaster<br>Hornady
<!-- Specifications -->
| parent = [[.284 Winchester]]
| case_type = Rebated, straight
| bullet = .4520
| land                = .4420
| land_ref            = <ref name="SAAMI data sheet"/>
| neck                = .4800
| neck_ref            = <ref name="SAAMI data sheet">((Cite web |url=https://saami.org/wp-content/uploads/2018/01/Z299-4_ANSI-SAAMI_CFR.pdf |title=CARTRIDGE and CHAMBER DRAWING - 450 BUSHMASTER |page=147 |access-date=2018-08-22 |archive-url=https://web.archive.org/web/20180822175305/https://saami.org/wp-content/uploads/2018/01/Z299-4_ANSI-SAAMI_CFR.pdf |website=SAAMI |archive-date=2018-08-22 |url-status=dead ))</ref>
| base                = .5000
| base_ref            = <ref name="SAAMI data sheet"/>
| rim_dia             = .4730
| rim_dia_ref         = <ref name="SAAMI data sheet"/>
| rim_thick           = .0540
| rim_thick_ref       = <ref name="SAAMI data sheet"/>
| case_length         = 1.700
| case_length_ref     = <ref name="SAAMI data sheet"/>
| length              = 2.260
| case_capacity     = 59.5
| length_ref          = <ref name="SAAMI data sheet"/>
| max_pressure = 38500
| pressure_method = SAAMI
<!-- Ballistic performance -->
| is_SI_ballistics = no
| bw1 = 250
| btype1 = SST
| vel1 = 2214
| en1 = 2722
| bw2 = 260
| btype2 = AccuTip
| vel2 = 2180
| en2 = 2744
| bw3 = 250
| btype3 = FTX Hornady BLACK
| vel3 = 2200
| en3 = 2686
| test_barrel_length = 20 in (508 mm)
| balsrc = Lynx Defense<ref name="lynxdefense">[https://lynxdefense.com/450-bushmaster/#3-450-bushmaster-ballistics  450 Bushmaster Ballistic Chart] LynxDefense.com</ref>
))
[[File:Bushmst450.jpg|thumb|The .450 Bushmaster was developed for big game hunting with modern rifles.]]

The '''.450 Bushmaster''' ('''11.48x43mmRB''') is a [[rifle cartridge]] developed by Tim LeGendre of LeMag Firearms, and licensed to [[Bushmaster Firearms International]]. The .450 Bushmaster is designed to be used in standard [[M16 rifle|M16]]s and [[AR-15 style rifle|AR-15s]], using modified [[Magazine (firearms)|magazines]] and upper [[Receiver (firearms)|receiver]]  assemblies.

==History==
The .450 Bushmaster is descended from the [[Jeff Cooper#Ammunition concepts|Thumper concept]] popularized by the gun writer [[Jeff Cooper]]. Cooper was dissatisfied with the small-diameter [[5.56×45mm NATO]] (.223 Remington) of the AR-15, and envisioned a need for a large bore (.44 cal or greater) cartridge in a [[semi-automatic rifle]] to provide one-shot kills on [[Big-game hunting|big-game]] animals at 250 yards. Inspired by this, LeGendre developed his .45 Professional cartridge,((when|date=April 2015)) and later((when|date=April 2015)) built and delivered an AR-15 in .45 Professional to Cooper.<ref name="Barnes2012">((cite book |author=Barnes |first=Frank C. |url= |title=Cartridges of the World: A Complete Illustrated Reference for More Than 1,500 Cartridges |date= |publisher=Gun Digest Books |year=2012 |isbn=978-1-4402-3059-2 |pages=97–))</ref>

Bushmaster requested((when|date=April 2015)) the ammunition manufacturer [[Hornady]] to produce the .45 Professional cartridge for this project, but Hornady wanted to shorten the cartridge case and overall length to accommodate their 0.452 in. 250-grain pointed SST flex-tip bullet. Bushmaster and LeGendre approved the change from a 1.772 in. (45 mm) case and 2.362 in. (60 mm) [[overall length]] (OAL) to the now standard 1.700 in. (43.18 mm) case and 2.260 in. (57.40 mm) OAL. This permitted operation in the more abundant and popular AR-15 platform versus the AR-10 platform. Also, a name change to ".450 Bushmaster" was approved.((citation needed|date=April 2015))

==Loadings and ballistics==
[[File:223+450 magazine top.jpg|thumb|.450 Bushmaster single-stacks in magazines, unlike .223, which sits in two staggered columns]]
[[File:450 ctg.jpg|thumb|right|200px|.450 Bushmaster cartridges and components]]
The .450 Bushmaster makes use of .452 in. bullets because the lower impact velocities and energies would not adequately expand the heavier jacketed .458 in. bullets.<ref>((Cite web|url=http://www.hornady.com/store/45-Cal-.452-250-gr-FTX-for-450-Bushmaster/|title=45 Cal .452 250 gr FTX (450 Bushmaster)|website=Hornady|access-date=2016-08-13|archive-url=https://web.archive.org/web/20170710114652/http://www.hornady.com/store/45-Cal-.452-250-gr-FTX-for-450-Bushmaster|archive-date=2017-07-10|url-status=dead))</ref> The cartridge is chambered in bolt-action rifles by Ruger, Savage, Mossberg, and Remington, Ruger's No. 1 single shot rifle, AR-15 rifles, as well as an AR-15 pistol by [[Franklin Armory]].<ref>((cite web|last=Pridgen|first=D.K.|title=FRANKLIN ARMORY XO-26 .450 BUSHMASTER|url=http://www.tactical-life.com/combat-handguns/franklin-armory-xo-26-450-bushmaster/|work=Tactical-Life Magazine|access-date=26 Feb 2014))</ref>

Ballistically, the .450 Bushmaster has a rather flat trajectory out to 200 yards; if the firearm is zeroed at 150 yards, the user can expect to see a rise of 1.8 inches at 100 yards, zero at 150 yards, and a drop of 4.9 inches at 200 yards.((citation needed|date=April 2015)) The cartridge fits single-stacked in a standard AR-15 magazine with a single-stack follower. A 10-round AR-15 magazine body yields a four-round <ref>((Cite web|url=https://tromix.com/product/lancer-magazine-4-round/|title=Lancer Magazine – 4 Round - Tromix Lead Delivery Systems|website=Tromix.com|date=27 June 2018|access-date=8 December 2019|archive-date=17 October 2021|archive-url=https://web.archive.org/web/20211017024527/https://tromix.com/product/lancer-magazine-4-round/|url-status=dead))</ref> magazine, a 20-round AR-15 magazine body yields a five- to seven-round <ref>((Cite web |url=https://dura-mag.com/product/duramag-ss-450-bushmaster-stainless-steel/ |title=Duramag SS .450 Bushmaster (Stainless Steel) |website=Duramag |access-date=2019-12-08 |archive-date=2019-12-08 |archive-url=https://web.archive.org/web/20191208204607/https://dura-mag.com/product/duramag-ss-450-bushmaster-stainless-steel/ |url-status=dead ))</ref> magazine, and a 30-round body yields a nine-round <ref>((Cite web|url=https://www.midwayusa.com/product/1006265648|title = AR-STONER Mag AR-15 450 Bushmaster 9-Round SS Black|website=Midwayusa.com))</ref> magazine. Hornady, Remington and Federal now manufacture ammunition for the rifle, and Starline manufactures empty brass for [[handloading]].

==See also==
*[[List of AR platform cartridges]]
*[[List of rebated rim cartridges]]
*[[List of rifle cartridges]]
*[[Table of handgun and rifle cartridges]]
*[[11 mm caliber]]
*[[.350 Legend]]
*[[.360 Buckhammer]]
*[[.400 Legend]]
*[[.444 Marlin]]
*[[.45-70]]
*[[.458 SOCOM]]
*[[.460 S&W Magnum]]
*[[.50 Beowulf]]
*[[12.7×55mm STs-130]]

==References==
((reflist))

==External links==
*[https://www.hornady.com/shop/?ps_session=1c8294f4873b4691e733e5f7db56e89a&page=shop%2Fbrowse&category_id=3ebab1c54f7fc02f9189b06b7e5c87d5 Hornady Manufacturing - 450 Bushmaster] ([https://web.archive.org/web/20180427184247/https://www.hornady.com/shop/?ps_session=1c8294f4873b4691e733e5f7db56e89a&page=shop/browse&category_id=3ebab1c54f7fc02f9189b06b7e5c87d5 Archived] 2009-08-05)
*[http://www.bushmaster.com/catalog_xm15_BCWVMS20-45H.asp Bushmaster .450 Rifle & Carbine - Bushmaster Firearms] ([https://web.archive.org/web/20090608063932/http://www.bushmaster.com/catalog_xm15_BCWVMS20-45H.asp Archived] 2009-08-05)
*[https://web.archive.org/web/20150423074612/http://www.hornady.com/store/450-Bushmaster-250-gr-FTX-LEVERevolution Hornady Manufacturing Company :: Ammunition :: Rifle :: Choose by Caliber :: 450 Bushmaster :: 450 Bushmaster 250 gr FTX LEVERevolution]

((284Winchester))
((Rebated rim cartridges))
((Bushmaster Firearms International))
((Hornady))

((DEFAULTSORT:450 Bushmaster))
[[Category:Rebated rim cartridges]]
[[Category:Pistol and rifle cartridges]]
[[Category:Bushmaster firearms]]

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