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Boys .55 cal (14mm) Anti-Tank Rifle
Boys .55 cal (14mm) Anti-Tank Rifle
Published: 2008/10/14
Channel: eanhjob
British Boys Anti-Tank Rifle
British Boys Anti-Tank Rifle
Published: 2015/08/24
Channel: Forgotten Weapons
Boys Mk1* Anti-Tank Rifle 5 round magazine test fired (.50bmg conversion)
Boys Mk1* Anti-Tank Rifle 5 round magazine test fired (.50bmg conversion)
Published: 2012/09/22
Channel: ORDNANCEdotCOM
.55 Boys
.55 Boys
Published: 2015/11/18
Channel: Hagge Bänke
The British Boys .55-inch Anti-Tank Rifle
The British Boys .55-inch Anti-Tank Rifle
Published: 2014/04/06
Channel: testyharry
WORLD WAR TWO NORMANDY RELIC BRITISH .55 BOYS ANTI TANK RIFLE ROUND
WORLD WAR TWO NORMANDY RELIC BRITISH .55 BOYS ANTI TANK RIFLE ROUND
Published: 2014/03/09
Channel: C J Campbell
Sammy Hagar - I Can
Sammy Hagar - I Can't Drive 55
Published: 2010/02/03
Channel: SammyHagarVEVO
Killing Tanks! BOYS Anti-Tank Rifle WWII Training Film
Killing Tanks! BOYS Anti-Tank Rifle WWII Training Film
Published: 2016/10/02
Channel: VDMA VIDEOS - Guns and Shooting Videos
BOYS ANTI TANK RIFLE
BOYS ANTI TANK RIFLE
Published: 2009/03/28
Channel: JOEY BRITT
Boys Anti Tank Rifle. .55 BSA MK1
Boys Anti Tank Rifle. .55 BSA MK1
Published: 2010/01/26
Channel: shotfirer1972
Boys 55 cal anti tank rifle
Boys 55 cal anti tank rifle
Published: 2012/01/21
Channel: v8rangee
WWII .50 BMG Anti-Tank Rifle
WWII .50 BMG Anti-Tank Rifle
Published: 2011/03/31
Channel: GunWebsites
Smith&Wesson 500 Magnum Revolver
Smith&Wesson 500 Magnum Revolver
Published: 2008/06/27
Channel: Z-Boys Gun Channel
Boys 55 cal anti tank rifle
Boys 55 cal anti tank rifle
Published: 2012/01/23
Channel: v8rangee
.55 Boys
.55 Boys
Published: 2016/10/20
Channel: Сергей Барчук
Efd 55 boys lead singer
Efd 55 boys lead singer
Published: 2015/01/05
Channel: Devin Montgomery
13 year old
13 year old's first Time shooting Boys Anti Tank Rifle
Published: 2015/10/25
Channel: HICKS439
WORLD WAR TWO NORMANDY RELIC BRITISH .303 CASES, .55 BOYS ANTI TANK RIFLE SHELL
WORLD WAR TWO NORMANDY RELIC BRITISH .303 CASES, .55 BOYS ANTI TANK RIFLE SHELL
Published: 2014/03/09
Channel: C J Campbell
55 boys vs s10 close call
55 boys vs s10 close call
Published: 2012/03/27
Channel: jayshafer16
Arizona Western indoor Championships 9-10 Boys 55 Meters Final 2-19-2017
Arizona Western indoor Championships 9-10 Boys 55 Meters Final 2-19-2017
Published: 2017/03/19
Channel: So Cal Supersonics
Efd 55 boys  practice
Efd 55 boys practice
Published: 2015/01/05
Channel: Devin Montgomery
John Dudley 3D setup for Wolves
John Dudley 3D setup for Wolves
Published: 2016/06/13
Channel: nockonarchery
Efd 55 boys practice part 2
Efd 55 boys practice part 2
Published: 2015/01/05
Channel: Devin Montgomery
Weslaco La Joya 81-55 (Boys Basketball)
Weslaco La Joya 81-55 (Boys Basketball)
Published: 2016/11/23
Channel: 956Sports
Darryl shooting the Boys .55in Anti Tank Rifle
Darryl shooting the Boys .55in Anti Tank Rifle
Published: 2014/08/10
Channel: Simon Jackson
WW2 Boys Anti-Tank Rifle in 50bmg
WW2 Boys Anti-Tank Rifle in 50bmg
Published: 2012/04/09
Channel: Shep0815
Boys Anti-Tank Rifle
Boys Anti-Tank Rifle
Published: 2009/02/27
Channel: ExNihiloJimmy
BOYS RIFLE
BOYS RIFLE
Published: 2014/06/17
Channel: veteran2000
Ww2 reenactment boys anti tank rifle 55cal
Ww2 reenactment boys anti tank rifle 55cal
Published: 2012/10/16
Channel: Harry Cotterall
Boys anti-tank rifle WW2 UK - WW2 UK Fusil antitanque Boys
Boys anti-tank rifle WW2 UK - WW2 UK Fusil antitanque Boys
Published: 2016/03/29
Channel: Armas Historicas - Guns Historical
Dirty Harry Fail
Dirty Harry Fail
Published: 2014/08/27
Channel: JukinVideo
Super Easy Slippers Tutorial For Beginners
Super Easy Slippers Tutorial For Beginners
Published: 2013/09/08
Channel: Made With Love By Glama
Hot chick firing a 55 cal ATR
Hot chick firing a 55 cal ATR
Published: 2012/08/02
Channel: v8rangee
Inglis Boys Anti Tank Rifle
Inglis Boys Anti Tank Rifle
Published: 2015/10/25
Channel: HICKS439
Minecraft Guns: Boys Anti Tank Rifle Mark 1
Minecraft Guns: Boys Anti Tank Rifle Mark 1
Published: 2014/04/16
Channel: vejvejtube
Great new price on this wonderful updated home!
Great new price on this wonderful updated home!
Published: 2011/11/11
Channel: Coldwell Banker Ridgefield
3 Boys Anti Tank Rifle Firing
3 Boys Anti Tank Rifle Firing
Published: 2014/04/26
Channel: Brad Bowman
Replica Boys Anti Tank rifle
Replica Boys Anti Tank rifle
Published: 2015/06/21
Channel: kevin powles
Cute boys in love 55 (Gay movie)
Cute boys in love 55 (Gay movie)
Published: 2013/04/06
Channel: kingkingjustin
So Long .55
So Long .55
Published: 2015/06/09
Channel: JewCrew
Firing the big bastard
Firing the big bastard
Published: 2008/02/15
Channel: BigNewo
The Funniest Guy at Work Episode .55
The Funniest Guy at Work Episode .55
Published: 2014/02/06
Channel: The Funniest Guy at Work
Shawnee Mission Northwest (SMNW) NEW SCHOOL RECORD 3:18.52 4x400m Relay(KS All-Time 4x400m #13)
Shawnee Mission Northwest (SMNW) NEW SCHOOL RECORD 3:18.52 4x400m Relay(KS All-Time 4x400m #13)
Published: 2012/05/27
Channel: Cougar Track
The Daimler Dingo
The Daimler Dingo
Published: 2009/07/30
Channel: Ben Azevedo
Boys anti-tank rifle
Boys anti-tank rifle
Published: 2014/08/07
Channel: WoG: Gun Disassembly Wiki
Home made Daimler Dingo part 2
Home made Daimler Dingo part 2
Published: 2011/10/05
Channel: Oddball
Morris Light Recce Car Mk 2
Morris Light Recce Car Mk 2
Published: 2009/09/01
Channel: rlangham12
Boys Anti-Tank Rifle Firing
Boys Anti-Tank Rifle Firing
Published: 2009/09/15
Channel: CromwellDay
Morris Light Reconnaissance Car Mk I
Morris Light Reconnaissance Car Mk I
Published: 2008/06/29
Channel: harry4468
Playing kickball at the Splash Park 2016 Ethan&Mason
Playing kickball at the Splash Park 2016 Ethan&Mason
Published: 2016/06/23
Channel: JUNGLE JIM
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WIKIPEDIA ARTICLE

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.55 Boys
55boys.png
Type Anti-tank rifle cartridge
Place of origin  United Kingdom
Service history
In service 1937–1945
Used by United Kingdom
Commonwealth of Nations
Finland, et al.
Wars WWII
Winter War
Continuation War
Production history
Designed 1937
Manufacturer Kynoch
Specifications
Parent case .50 BMG
Bullet diameter 14.30 mm (.565 in)
Neck diameter 15.392 mm (.606 in)
Shoulder diameter 15.34 mm (.604 in)
Base diameter 20.168 mm (.794 in)
Rim diameter 20.244 mm (.797 in)
Rim thickness 2.44 mm (.096 in)
Case length 97.79 mm (3.85 in)
Overall length 133.43 mm (5.253 in)
Ballistic performance
Bullet mass/type Velocity Energy
946 gr (61 g) Mark I 2,495 fps 17,726 joules (13,074 ft-lbs.)
741 gr (48 g) APCR Tungsten 3,100 fps 21,434 joules (17,726 ft-lbs)
Test barrel length: 914.4 mm (36 in)
Source(s): Ammo Encyclopedia, 2nd Edition by Michael Bussard

The .55 Boys (13.9×99mmB in metric) is an anti-tank cartridge used by the United Kingdom in World War II. It was designed for use with the Boys Anti-Tank Rifle.

Design[edit]

The .55 Boys is a .50 BMG cartridge necked up to accept a .55 caliber bullet and with a belt added to its case. It performed poorly when compared to contemporary foreign anti-tank rounds, such as the German 7.92×94mm Patronen and the Soviet 14.5×114mm rounds and, as a result, it was quickly deemed obsolete.[1]

History[edit]

The concept of a small arm round for use against tanks began with the German 13.2mm TuF round, designed during World War I for use against British armour.

In the 1930s, the United Kingdom began designing anti-tank rifle to counter enemy armoured vehicles in the event of a war. Early work on a 13.2mm round was started as a base, likely influenced by the first mass-produced anti-tank cartridge, the 13.2mm TuF, used a 13mm caliber bullet. However, the idea of a 13.2mm round was eventually abandoned.[2]

Development on what is known as the .55 Boys was started by Captain H C Boys, a designer at the Royal Small Arms Factory, Enfield. The .55 Boys was designed to be a modified .50 BMG round necked up to accept a larger, steel core bullet in order to increase its armor penetration. A belt was also added to ensure the round could not be chambered in arms designed for the .50 BMG.

The .55 Boys was adopted and manufactured alongside the Boys Anti-Tank Rifle in 1937 throughout the Commonwealth of Nations by firms such as Kynoch. However, when the United Kingdom entered World War II, the .55 Boys round was soon found to be insufficient against even early war Axis tanks in late 1939 and 1940.[1] However, the United Kingdom had to rely on the .55 Boys round for several years because no better infantry anti-tank weapons were available. When the PIAT anti-tank weapon was introduced in 1943, the shaped charges it fired proved to be far more effective against enemy armor than the .55 Boys round had[1] The Boys rifle was phased out of service as the PIAT became the British military's primary handheld anti-tank weapon. Despite its lack of effectiveness as an anti-tank weapon, the .55 Boys was used throughout World War II in both the Pacific and Atlantic theaters and also saw use during the Winter War and Continuation War by Finland. By the conclusion of World War II, the .55 Boys was no longer used in any major capacity.

Variants[edit]

The .55 Boys round went through two major variants in its lifetime, along with an experimental variant that was never adopted by the United Kingdom.

Mark I[edit]

This is the first variant of the .55 Boys. It uses a 926 gr. hardened steel core bullet with a lead sleeve, which is covered with a steel jacket. A ball and tracer version of this round were also created along with a practice round using an aluminum core was also produced in order to be more feasible for training. It has a muzzle velocity of roughly 747 m/s (2,450.1 ft/s).

Mark II[edit]

An improved loading named the Mark II was released in order to increase the round's velocity and its penetration. It generates a muzzle velocity of approximately 884 m/s (2,899.5 ft/s).[3]

At an ideal angle, the Mark 2 round was able to pierce .91 inches (23.2mm) of armor at 100 yards, .82 inches (20.9mm) at 300 yards and .74 inches (18.8mm) at 500 yards.[4]

APCR Tungsten Round[edit]

An experimental APCR (Armor Piercing Composite Rigid) .55 Boys round was designed in 1942.[5] It used a tungsten core round instead of a steel core, which greatly increased its penetrating ability and gave a boost to its muzzle velocity from the Mark II's 884 m/s to approximately 944 m/s (3100 ft/s). It differs from the Mark I and II rounds because of its two-part bullet. This model was never officially adopted because far better anti-tank rounds and weapons, such as the PIAT, were entering service at the time. The .55 Boys, even with a greatly improved bullet, was simply too weak to defeat the tanks being fielded by the Axis powers.

Gallery[edit]

See also[edit]

Notes[edit]

External links[edit]

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