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...x 5-[[inch]] (127-[[millimeter]]) guns<br/>8 x 40-millimeter guns<br/>8 x 20-millimeter guns<br/>2 x [[depth charge]] tracks ...ringay Point]]. That afternoon, the planes of Patrol Bomber Squadron (VPB) 20 arrived and moored, and ''Baritaria'' carried out routine fueling operation

...ert|4|in|mm|0|abbr=on}}/50 gun<ref name=Con-123 /><br>8 × {{convert|21|in|mm|0|abbr=on}} [[torpedo tube]]s ...ed with four {{convert|4|in|cm|adj=on}} guns and had eight {{convert|21|in|mm|adj=on}} [[torpedo tube]]s. ''Wainwright'' was powered by a pair of [[steam

|Ship commissioned=20 February 1925, [[Delaware Bay]]<ref name=USCG /> ...ert|4|in|mm|0|abbr=on}}/50 gun<ref name=Con-123 /><br>8 × {{convert|21|in|mm|0|abbr=on}} [[torpedo tube]]s<ref group=Note>''Conway's'' (p. 123) lists ei

| name = 20 ItK 40 VKT | image = [[File:20 ITK 40 VKT Maneesi 1.JPG|300px]]

[[Image:2001gun88mmwiki.jpg|thumb|88 mm display at Imperial War Museum Duxford, 2001]] ...nti-aircraft warfare|anti-aircraft]] and [[Anti-tank warfare|anti-tank]] [[artillery]] gun from World War II. They were widely used throughout the war, and coul

|caption=Aft 283 mm dual turret on [[Coastal defence ship]] Gustav V |caliber={{convert|283|mm|in}}

[[File:Quad ADEN 30mm Cannon.jpg|thumb|A quad 30 mm ADEN cannon package from the pictured [[Hawker Hunter]].]] The '''Royal Small Arms Factory ADEN''' is a 30 mm [[cannon]] used on many [[military aircraft]], particularly those of the Br

...llery]], and [[RBL 12 pounder 8 cwt Armstrong gun|12-pounder (3 inches /76 mm) field guns]]. ...0 mm) heavy gun. The [[Royal Navy]] used all these guns and all except the 20-pounder saw service in [[New Zealand]].

|name= mitrailleuse de 25 mm CA mle 39 |image= [[Image:Hotchkiss 25 mm CA mle 39 Saumur 01.jpg|300px]]

|length= 1016 mm |part_length= 115 mm

|length= {{convert|1030|mm|ftin|abbr=on}} |part_length= {{convert|875|mm|ftin|0|abbr=on}} without gas generator

...by Capt. D.R. Williams, of [[Covington, Kentucky]], who later served as an Artillery Captain with a battery of his design. It was a breech-loading, rapid-fire During the early trials of the gun, the Richmond Daily Exchange dated May 20, 1862, reported that: “General Floyd attended a trial of the Williams’

| caliber = {{Convert|23|mm|0|abbr=on}} ...lkov-Yartsev VYa-23''' (Волков-Ярцев ВЯ-23) is a {{Convert|23|mm|abbr=on}} [[autocannon]] used on [[Soviet]] aircraft during [[World War II]

...sian Civil War]]<br>[[Greco-Turkish War]]<br>[[World War II]] ''As coastal artillery'' |caliber={{convert|12|in|mm|sing=on|sigfig=4}}

|caliber={{convert|127|mm|in}} <!-- Artillery specifications -->

|name= 13.2 mm Hotchkiss machine gun |caption=A '''mitrailleuse de 13.2 mm CA mle 1930''', in Batey ha-Osef Museum, Tel Aviv, Israel.

|caliber={{convert|149.1|mm|in}} <!-- Artillery specifications -->

|caliber={{convert|149.1|mm|in}} <!-- Artillery specifications -->

|name= 20 cm SK C/34 naval gun ...n=Four turrets seen aboard ''Admiral Hipper'' was the standard mounting of 20 cm SK C/34 guns.

| cartridge = 37 × 263 mm. B <!-- Artillery specifications -->

|weight=20 tonnes<ref name="Campbell">{{cite book| title=Naval Weapons of World War Tw |caliber=8inch&nbsp;mm

|name= 20 cm/50 3rd Year Type naval gun |caliber={{convert|20|cm|in|sing=on|sigfig=1}}<ref name="Campbell"/>

The '''20 mm [[Stahlwerke Becker|Becker]]''' was a German automatic cannon developed for ...June [[1915 in aviation|1915]] calling for an aircraft cannon of under 37 mm caliber and 70 kg weight capable of firing a 10-round burst. Tests commence

The German '''28&nbsp;cm C/28 naval gun''' was a 283&nbsp;mm 52-[[Caliber#Caliber as measurement of length|caliber]] [[built-up gun]] de Characteristics of SK C/28 and the later SK C/34 283&nbsp;mm shells are in the table below:

|caliber=128 mm (5.03 in) <!-- Artillery specifications -->

|length=816 in (20.73 m) |part_length=800 in/20.3 m (50 [[Caliber#Caliber_as_measurement_of_length|calibers]])

|caliber={{convert|8|in|mm|sing=on|sigfig=3}}<ref name="Campbell"/> <!-- Artillery specifications -->

|name=20 mm modèle F2 gun |caliber=20 mm

...ola 2.jpg|thumb|right|300px|Detailed view of a BMP-1 turret showing the 73 mm gun tube of the 2A28]] The 2A28 is a 73&nbsp;mm low pressure smoothbore semi-automatic gun with wedge breechblock. The gun

|cartridge=[[20 x 138B cartridge|20 × 138 mm. B]] |caliber=20 mm (.79 in)

|caliber= {{convert|3|in|mm|sing=on}} |rate= 20 rpm

|caliber= {{convert|3|in|mm|sing=on|sigfig=4}} |rate= 20 rpm

The '''Shipunov 2A42''' is a [[Soviet Union|Soviet]]/[[Russia]]n 30&nbsp;mm [[automatic cannon]]. It is built by the Tulamashzavod Joint Stock Company. ...ent projects from various manufacturers. The design bureau for the 30&nbsp;mm 2A42 cannon is the KBP Instrument Design Bureau.

|name=37 mm automatic air defense gun M1939 (61-K) |caption=61-K in Saint Petersburg Artillery Museum.

|caliber=37 mm (1.45 in) <!-- Artillery specifications -->

|caption=381 mm/50 [[Caliber#Caliber as measurement of length|caliber]] guns firing during |caliber={{convert|381|mm|in|sing=on|sigfig=2}}<ref name="Campbell"/>

|caliber={{convert|4|in|mm|sigfig=1}} <!-- Artillery specifications -->

|part_length={{convert|244.75|in|m|sigfig=4}} bore (55 [[Caliber (artillery)|calibres]]) |caliber=4.45-inch (113 mm)<ref name=Janes1999/><!-- Many sources quote 114mm as the calibre but it is

|name=45&nbsp;mm anti-aircraft gun (21-K) <!-- Artillery specifications -->

|cartridge= 5 inch (127 mm) <!-- Artillery specifications -->

|caliber={{convert|5|in|mm|0}} |rate= 16–20 rounds per minute automatic<ref name="USN facts">{{cite web | url=http://ww

|caliber={{convert|150|mm|in|sigfig=1|sp=us}} <!-- Artillery specifications -->

<!-- Artillery specifications --> '''7,62 ITKK 31 VKT''' or '''7,62&nbsp;mm VKT anti-aircraft machine gun''' was the primary anti-aircraft machine gun

|image= [[Image:75 mm L45 M16.png|250px]] |caliber= 75 mm

|image=[[Image:Skoda 75 mm model 1937 anti-aircraft cannon.right side.JPG|300px]] |caliber={{convert|75|mm|in}}

|caliber=8 in (203 mm) |elevation=+65 / -5 degrees<br />Rate: 20 degree/second

|caliber={{convert|200|mm|in|sigfig=1|sp=us}} <!-- Artillery specifications -->

|caption= 90 mm M1 at [[CFB Borden]] |name= 90 mm M1A1

|name=9 cm PL kanon vz. 12/20 |caliber={{convert|90|mm|in}}

[[Image:M2Bradley-M242.jpg|thumb|[[M242]] 25&nbsp;mm Bushmaster autocannon on an [[M2 Bradley]]]] [[Image:XM307-01.jpg|thumb|[[XM307]] 25&nbsp;mm caliber 2-man portable autocannon]]

|caliber={{convert|13.5|in|mm|sigfig=4|sing=on}} ...vert|23820|yd|m|sigfig=4}} at 20° (L); {{convert|23740|yd|m|sigfig=4}} at 20° (H); {{convert|40600|yd|m|sigfig=4}} at 40° (H, WWII railway gun, with S

| caliber = {{convert|18|in|mm}} <!-- Artillery specifications -->

...40 mm grenade]]s in both the low velocity 40x46 mm and high velocity 40x53 mm calibers which uses what it calls [[High-Low System|High-Low Propulsion Sys HE grenades may well be the standard for both types of 40 mm grenades, but over the years the functions of the weapons using these grena

|type=[[Naval gun]]<br>[[Coastal artillery|Coastal defence gun]]<br>[[Field gun|Heavy field gun]] |caliber= {{convert|6|in|mm|sigfig=4}}

|caliber= {{convert|6|in|mm|sigfig=4}} ...[Caliber#Caliber_as_measurement_of_length|calibres]] high-velocity [[naval artillery|naval gun]] which was mounted as primary armament on [[cruiser]]s and secon

|caliber={{convert|6|in|mm|sing=on|sigfig=4}}<ref name="Campbell"/> <!-- Artillery specifications -->

|type= [[Naval gun]]<br>[[Coastal artillery|Coast defence gun]] ...t|153.2|in|mm|sigfig=4}} (25.53 calibres)<br>Mk IV, VI : {{convert|156|in|mm|sigfig=4}} (26 calibres)<ref name=Gunnery1902>Text Book of Gunnery 1902, Ta

The '''Berezin B-20''' (Березин Б-20) was a [[20 mm caliber]] [[autocannon]] used by [[Soviet]] aircraft in [[World War II]]. ...bomber until the [[Nudelman-Rikhter NR-23]] cannon became available. The B-20 was a welcome replacement for the [[ShVAK]] because is was significantly li

...r>Mk VII : {{convert|204|in|mm|sigfig=4}}<br>Mk IV & VI : {{convert|237|in|mm|sigfig=4}} bore<ref name=Gunnery1902/> |caliber={{convert|8|in|mm|sing=on|sigfig=4}}

|caliber={{convert|8|in|mm|sing=on|sigfig=3}}<ref name="Campbell"/> <!-- Artillery specifications -->

|caliber={{convert|120|mm|in}} <!-- Artillery specifications -->

|name=Bofors 37 mm anti-tank gun |cartridge=37×249 mm. R

|name= Bofors 40 mm gun |caption= '''Bofors 40 mm/L60'''. This example includes the British-designed ''Stiffkey Sight'', bein

|name=Cannone-Mitragliera da 20/65 modello 35 |image=[[Image:Breda 20-65 anti-aircraft gun in Beijing.jpg|300px]]

[[File:Bundesarchiv Bild 101I-567-1503E-20, San Felice, Inspektion von Fallschirmtruppen.jpg|300px|right|thumb|Cannone ...used during [[World War II]]. The designation means it had a caliber of 75 mm, the barrel was 46 caliber-lengths long and it was accepted in service in 1

|cartridge= 84×246 mm. R |caliber= 84 mm. (3.31 inches)

|caliber= 20 (0.79 in) mm × 110 mm (USN) The '''Colt-Browning Mk 12''' was a 20 mm [[cannon]] widely used by the [[United States Navy]] after [[World War II]]

The '''Solothurn ST-5''' is a 20 mm [[anti-aircraft gun]] designed by [[Solothurn]] in [[Switzerland]] which ul ...of the weapon for ship-board air defense. The weapon was designated '''20 mm C/30''' and equipped several German naval vessels during World War II. Thi

|width=10 in (256 mm) |height=11.5 in (292 mm)

|cartridge= 30 × 173 mm |caliber= [[30 mm caliber]]

...case. It was intended to have greater range and hitting power than the 20 mm Vulcan, while the caseless ammunition would have alleviated the problems of [[Category:25 mm artillery]]

|cartridge= 30 × 173 mm |caliber= [[30 mm caliber]]

...ghting troops of industrialized nations, Gatling guns could be targeted by artillery they could not reach and their crews could be targeted by [[sniper]]s they ...1865.jpg|thumb|right|A British 1865 Gatling gun at [[Firepower - The Royal Artillery Museum]]]]

|caliber= 20 mm <!-- Artillery specifications -->

|length=1387 mm (GSh-23)<br/> 1537 mm (GSh-23L) |part_length=1000 mm

|image=[[File:TCM-20-hatzerim-2.jpg|300px]] |caption=HS.404 in the TCM-20 twin anti-aircraft configuration, displayed at the Israeli Air Force Museum

...n the process<ref>[http://www.janes.com/extracts/extract/jah/jah_0114.html 20 x 139 round (Switzerland)], Jane's Ammunition Handbook</ref>. ....uk/an_introduction_to_collecting_20.htm "An introduction to collecting 20 mm cannon cartridges"], Anthony Williams</ref> The HS.820's high 1100 m/s [[mu

...a Japanese [[autocannon]] used during World War II. It was a [[Type 97 20 mm anti-tank rifle]] adopted for use in bomber turrets. *'''Caliber:''' 20&nbsp;mm (0.8&nbsp;in)

...of the magazine-fed [[Ho-1 cannon]], itself derived from the [[Type 97 20 mm anti-tank rifle|Type 97 antitank rifle]]. *'''Caliber:''' 20&nbsp;mm (0.8&nbsp;in)

...tegrating links. The cartridge used was a shortened version of the Allied 20 x 110 Hispano-Suiza. *'''Caliber:''' 20 mm (0.8 in)

...uring World War II. It was a scaled-up and modified version of the 20&nbsp;mm [[Ho-5 cannon]], itself a scaled up Model 1921 aircraft Browning. *'''Caliber:''' 30&nbsp;mm (1.2&nbsp;in)

! width=12% | [[Caliber]] (mm) | 20 mm || [[Oerlikon 20 mm cannon]] || {{CHE}} || World War II

| armour=6-20 mm | primary_armament=40&nbsp;mm Bofors/60 AA-gun

|cartridge= 20 × 102 mm. |caliber= 20 mm

|caliber= [[30 mm caliber|30 x 113 mm]] |length= {{convert|1638|mm|in|sigfig=3|abbr=on}}

| caliber = [[25 mm caliber|{{convert|25|mm}} caliber]] The '''M242 Bushmaster''' is a [[25 mm caliber|25 mm]] (25x137mm) [[chain gun|chain-fed]] [[autocannon]]. It is used extensively

|length= {{mm to in|1650|abbr=on|precision=1|wiki=yes}} |part_length= {{convert|1143|mm|abbr=on|1}}

The '''Pontiac M39''' was a 20&nbsp;mm single-barreled [[revolver cannon]] developed for the [[United States Air F ...nch]] [[DEFA cannon|DEFA]], but American designers chose a smaller 20&nbsp;mm round to increase the weapon's rate of fire and [[muzzle velocity]] at the

|length= {{convert|71.93|in|mm|abbr=on}} |cartridge= 20 × 102 mm.

|length={{mm to in|2207|abbr=on|precision=1|wiki=yes}} |width={{convert|202|mm|abbr=on|1}} (in mount)

|cartridge= 15 x 96 mm cartridge |caliber= 15 mm

|cartridge= 20 x 80 mm |caliber= 20 mm

|length={{convert|1057|mm|in}} |part_length={{convert|23|in|mm}}

[[Image:20 mm Madsen.jpg|thumb|20 mm Madsen]] ...-out 23&nbsp;mm round was also produced, generally known as the '''23&nbsp;mm Madsen'''.

...evelopments by the [[Allies of World War II|Allies]]. A [[30 mm caliber|30 mm]] version was developed as the '''MG 213C''' or '''MK 213''' and it was thi [[Category:20 mm artillery]]

...weapon system|CIWS]], using twelve [[Oerlikon Contraves|Oerlikon]] 20&nbsp;mm/120 guns mounted in 2 rows of 6 guns each. The system's primary purpose is * '''Gun''': 12 × Oerlikon 20&nbsp;mm/120.

| cartridge = 30x173 mm | caliber = [[30 mm caliber|{{convert|30|mm}} caliber]]

| name = Mk 20 Mod 0 | cartridge = [[40 mm grenade#40x46mm SR|40x46mm SR]]

|caliber= 30 mm (1.18 in) ...s quite powerful, but with a relatively low initial velocity, while the 37 mm was lacking in rate of fire and ammunition reserve.

|name=Oerlikon 20 mm cannon |caliber=20 mm

|name= 35 mm Oerlikon GDF-003 |image= [[File:35 mm Oerlikon.jpg|300px]]

...ter aircraft]]'s wing. The FF series served as the inspiration for many 20 mm cannon that would be used in [[World War II]] , including the French [[Hisp ...mm round which gave 750 m/s, and the 39 kg '''FF S''' firing a 20 mm x 110 mm round at 830 m/s at a slightly slower 470 rounds per minute. The original g

|cartridge=40×304 mm. R |caliber=40 mm (1.57 in)

|caliber=47 mm (1.85 in) |rate=20 rounds per minute

...ifle''' was a type of [[Muzzleloader|muzzle loading]] [[Rifling|rifled]] [[artillery]] weapon used extensively in the [[American Civil War]]. ...sburg National Military Park. [http://www.nps.gov/archive/gett/soldierlife/artillery.htm "Big Guns at Gettysburg"]. Retrieved January 18, 2008</ref>

| caliber = 20 mm ...iulian |url=http://www.navweaps.com/Weapons/WNUS_Phalanx.htm |title=USA 20 mm Phalanx Close-in Weapon System (CIWS) |publisher=Navweaps.com |date= |acces

|caliber=20 mm (0.78 in) ...'''Polsten''' was a low cost Polish development of the 20 mm [[Oerlikon 20 mm cannon|Oerlikon gun]]. The Polsten was designed to be simpler and much chea

|caliber={{convert|3|in|mm|0|abbr=on}} |rate=20 rd/min<ref>20 rounds per minute is quoted in [http://www.gwpda.org/naval/brassey/b1901o08

|caliber= 40 mm (1.575 in) <!-- Artillery specifications -->

|weight= 20,541 lb (9,317 kg) |caliber= 3.7 inches (94 mm)

|name=QF 3 inch 20 cwt anti-aircraft gun ...[Caliber#Caliber_as_measurement_of_length|cal]])<br>Total {{convert|140|in|mm|sing=on}}<ref name=Hogg&Thurston1972page79/>

|type=[[Naval gun]]<br>[[Field gun|Medium field gun]]<br>[[Coastal artillery|Coastal defence gun]] ...(20.41 kg)<ref>Various shell weights, both heavier and lighter than 45 lb (20.41 kg), were tried. Early Mk I–IV Common Lyddite shells weighed {{convert

|type= [[Naval gun]]<br>Heavy [[anti-aircraft gun]]<br>[[Coastal artillery|Coastal defence gun]] |caliber={{convert|4|in|mm|sigfig=4|sing=on}}

|type= [[Naval artillery|Naval gun]]<br>[[Coastal artillery|Coast defence gun]] |caliber={{convert|4|in|mm|sing=on|sigfig=4}}

| caliber = {{convert|5.25|in|mm|sing=on}} <!-- Artillery specifications -->

|name= QF 6 inch 40 calibre naval gun<br>''Type 41 6-inch (152 mm)/40-caliber'' |caliber={{convert|6|in|mm|sigfig=4}}

|name=RBL 20 pounder gun |image=[[Image:RBL 20 pounder Armstrong field gun.jpg|300px]]

|caliber= {{convert|6.3|in|mm|0}} <!-- Artillery specifications -->

<!-- Artillery specifications --> |elevation=-20 to 60

...0 mm Twin Anti-Aircraft Cannon IWM 3.jpg|thumb|An Argentine Rheinmetall 20 mm Twin Anti-Aircraft Cannon in the [[Imperial War Museum]]]] [[File:Scale Rheinmetall 20 mm.JPG|thumb|The same gun, but with an adult male nearby for a reference of sc

...g|right|thumb|A [[German Army]] [[Marder (IFV)|Marder]] fires its Rh202 20 mm cannon on a training exercise.]] The '''Rh202''' is [[autocannon]] with a [[caliber|calibre]] of 20 mm designed and produced by [[Rheinmetall]].

|length= 1,468 mm |height= 165 mm

...Shpitalny-Vladimirov large-calibre for aircraft") was a [[20 mm caliber|20 mm]] [[autocannon]] used by the [[Soviet Union]] during [[World War II]]. It w ...liber round and serial production was launched. Some months later the 12.7-mm version has been removed from manufacture altogether.<ref>http://www.airpag

| pages = 20–21 ...c control was lost. The Mk. 1 and Mk. 1A computers contained approximately 20 servomechanisms, mostly position servos, to minimize torque load on the com

|caliber=12 in (305 mm) <!-- Artillery specifications -->

The '''Type 2 20&nbsp;mm AA Machine Cannon''' was a [[Japan]]ese-designed [[anti-aircraft gun]], bas Two of the guns were mounted on together to form the '''20&nbsp;mm Twin AA Machine Cannon'''.

|caliber=120 mm |rate=20 rpm

|caliber=149.1 mm |max_range=14.8 km against a target at 8,000 m. <br>Maximum ceiling 20,000 m

The '''Type 730''' is a Chinese seven-barrelled 30&nbsp;mm [[Gatling gun]] [[CIWS]]. It has a PLA-N designation '''H/PJ12'''. It is m ...ray]] technology that enables the radar to pick up the splashes of 30&nbsp;mm rounds. Like the western CIWS, the information is processed on site, via l

|caliber=75 mm |rate= 15–20 rounds/minute

|unit_cost= 20,000 yen (in the year 1941) <!-- Artillery specifications -->

|image=[[Image:Type 11 75 mm AA gun.jpg|300px]] |caliber=75 mm

...]] used during [[World War II]]. It was a scaled-up version of the 20&nbsp;mm [[Oerlikon FF]] cannon. *'''Caliber:''' 30&nbsp;mm (1.2&nbsp;in)

...ft gun]]. It consisted of two [[Type 98 20 mm AA Machine Cannon|Type 98 20 mm]] guns. It was introduced in 1944 and approximately 500 guns were produced. * '''Caliber''': 20 mm

|name=Type 98 20 mm anti-aircraft machine cannon |image=[[Image:Type 98 Japanese 20 mm anti-aircraft gun - Beijing Museum.jpg|300px]]

...(arms)|advanced primer ignition blowback]] mechanism pioneered by the [[20 mm Becker|Becker]] cannon, but fired different ammunition: 20x72RB, 20x100RB a ...igō Kizyū, Kanji: 九九式二号機銃) The Japanese Navy classified 20-mm weapons as machine guns rather than cannon.<ref name="Mikesh"/> These weapo

...FFFG granulation size. [[Quarter (United States coin)|Coin]] (diameter 24 mm) for comparison.]] ...which no grains were retained. Recognised grain sizes are Gunpowder G 7, G 20, G 40, and G 90.

...e=2001-09-27 | location=London | first=Derek | last=Brown | accessdate=May 20, 2010}}</ref>), but as similar phrases have been used by adherents of sever ...ces Start of a "War on Terror" |publisher=globalsecurity.org |date=2001-09-20}}</ref><ref>{{Cite web |url=http://www.globalsecurity.org/military/library/