| 词条 | .450 Bushmaster |
| 释义 |
| name = .450 Bushmaster | image = 450 BM + 223.jpg | image_size = 200px | caption = .450 Bushmaster (left), .223 Remington (right) | origin = United States | type = Rifle | designer = LeMAG Firearms LLC | manufacturer = Bushmaster/Hornady | parent = .284 Winchester | case_type = Rebated rim, straight wall | bullet = .452 | neck = .4800 | neck_ref = [1] | base = .5000 | base_ref = [1] | rim_dia = .473 | rim_dia_ref = [1] | rim_thick = .054 | rim_thick_ref = [1] | case_length = 1.700 | case_length_ref = [1] | length = 2.260 | length_ref = [1] | max_pressure = 38,500 psi (265 MPa) | pressure_method = SAAMI | is_SI_ballistics = no | bw1 = 250 | btype1 = SST | vel1 = 2214 | en1 = 2722 | bw2 = 260 | btype2 = AccuTip | vel2 = 2180 | en2 = 2744 | test_barrel_length = 20 in (508 mm) | balsrc = Hornady & Remington[2]}} The .450 Bushmaster 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 the standard M16s and AR-15s, using modified magazines and upper receiver assemblies. HistoryThe .450 Bushmaster is descended from the "Thumper" concept popularized by 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 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.[3] 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 to accommodate their 0.452" 250-grain pointed SST Flex-Tip bullet. Bushmaster and LeGendre approved the change from 1.771" to the now-standard 1.700", and a name change to ".450 Bushmaster".{{citation needed|date=April 2015}} Loadings and ballisticsThe .450 Bushmaster is a high-pressure rifle case, thus making efficient use of heavy .452" bullets.[4] The cartridge is chambered in bolt action rifles by Ruger and Savage, AR-15 rifles, as well as an AR-15 pistol by Franklin Armory.[5] Ballistically the round is very flat 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 five-round magazine, a 20-round AR-15 magazine body yields a nine-round magazine, and a 30-round body yields a 13-round magazine. Hornady, Remington and Federal now manufacture ammunition for the rifle, and Starline manufactures empty brass for handloading. See also
References1. ^1 2 3 4 5 {{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 |dead-url=yes |df= }} 2. ^[https://www.remington.com/ammunition/centerfire-rifle/premier-accutip-450-bushmaster PREMIER® ACCUTIP™ 450 BUSHMASTER] Remington Arms Company 3. ^{{cite book|author=Frank C. Barnes|title=Cartridges of the World: A Complete Illustrated Reference for More Than 1,500 Cartridges|url=https://books.google.com/books?id=bjhy8uv196IC&pg=PA97|date=5 October 2012|publisher=Gun Digest Books|isbn=1-4402-3059-5|pages=97–}} 4. ^{{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|dead-url=yes|df=}} 5. ^{{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|accessdate=26 Feb 2014}}
External links
2 : Pistol and rifle cartridges|Bushmaster firearms |
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