Top 10 Articles

LS-Studio
GayRomeo
Justus_Dahinden
Mercedes Benz OM601
Diyanet İşleri Başkanlığı
Radically 25
Ral color system
RTLnow.de
New concept
Electromagnetic compatibility

News:

4.6x30mm

4.6x30mm
Type Pistol
Place of origin  Germany
Production history
Designer Heckler & Koch
Specifications
Case type Rimless, bottleneck
Bullet diameter .177 in (4.5 mm)
Neck diameter .200 in (5.1 mm)
Shoulder diameter .320 in (8.1 mm)
Rim diameter .340 in (8.6 mm)
Case length 1.420 in (36.1 mm)
Ballistic performance
Bullet weight/type Velocity Energy
24.7 gr (1.60 g) 2,378 ft/s (725 m/s) 312 ft·lbf (423 J)
Source: HKPro [1]

The 4.6x30mm cartridge is a type of ammunition used in the H&K MP7 PDW and by the H&K UCP pistol. It is designed to minimize weight and recoil while increasing penetration of body armor. It features a bottlenecked case and a pointed, steel-core, brass-jacketed bullet.

Contents

Background

The round was designed as a competitor to the 5.7x28mm round developed by Fabrique Nationale. In head-to-head comparison of the two rounds, 4.6x30mm fired out of the MP7 is slower and offers slightly shorter range and reduced terminal ballistics than the 5.7x28mm fired out of the P90.[citation needed][dubious – discuss] SS195LF, with a 28-grain (1.8 g) projectile, fired out of the P90 can achieve muzzle velocities of approximately 2,500 ft/s (760 m/s).[citation needed]

Performance

The 4.6x30mm cartridge and the 5.7 x 28 have been criticized for having low terminal effectiveness. This claim comes especially from those who disagree with the "energy dump" theory of wound ballistics such as Dr. Martin Fackler and Dr. Gary Roberts. Kinetic energy manifests itself in human tissue in temporary stretching of tissue, which most tissue except for liver and neural tissue is able to withstand with little ill effect. Dr. Fackler and Dr. Roberts claim that the combination of permanent wound cavity and frequently insufficient penetration (the FBI recommends a minimum of 12 inches (300 mm) of penetration in ballistic gelatin) make these PDW cartridges terrible terminal performers. Slow motion videos show that the 4.6 mm bullet yaws at impact on soft tissue. This is because the mass centre of the bullet is behind the geometrical center causing the back to come forward at impact and therefore tumbling through soft tissue creating much larger damage [1]. Due to the lighter weight of the bullet one can carry more ammunition and therefore increasing the fire power. Also, due to the lighter weight of the bullet, aiming in rapid fire is much easier as recoil depends much on the weight of the bullet. And because of the lesser diameter penetration power to armor is much higher as the crisat test proves.[2]

The latest version ("Ultimate Combat") uses a 2g steel projectile at the same velocity, giving it a moderate edge in penetration over the 5.7x28mm cartridge. Terminal effectiveness is comparable to the 5.7 mm cartridge due to the increase in energy delivery.

Comparison

  • Penetration of a ballistic gelatin block at 50 m (20 % gelatin block 300 mm long) - 280 mm (11 in)
  • Energy transfer through body armor at 50 m (1.6 mm titanium + 20 layers of Kevlar) - 220 J
  • Energy transfer through body armor at 100 m (1.6 mm titanium + 20 layers of Kevlar) - 115 J

The same tests were performed on the 5.7x28mm round:

  • Penetration of a ballistic gelatin block at 50 m (20 % gelatin block 300 mm long) - 230 mm
  • Energy transfer through body armor at 50 m (1.6 mm titanium + 20 layers of Kevlar) - 180 J
  • Energy transfer through body armor at 100 m (1.6 mm titanium + 20 layers of Kevlar) - 65 J

[1]

Muzzle Energies Compared:

Original 4.6 mm: 420 Joule, 310 ft·lbf (fired from MP7)

Standard 5.7 mm: 513 Joule, 379 ft·lbf (fired from P90)

2g Steel 4.6 mm: 525 Joule, 388 ft·lbf (fired from MP7)

Weapons

See also

References

  1. ^ a b hkpro.com
  2. ^ YouTube video

External links

The original article is from Wikipedia. To view the original article please click here.
Creative Commons Licence

 
Custom Search