9х18mm «Ultra» 1936
Performance characteristics
9х18mm «Ultra»
Caliber, mm
9
The length of the cartridge, mm
25
The length of the sleeve, mm
17,7
cartridge weight, g
10
bullet weight, g
6,5
The weight of powder, g
0,32
Muzzle velocity, m / s
300-330
muzzle energy, J.
303-363
Cartridge under the name "Ultra," began to produce in 1936 the firm "Gecko" as an intermediate power cartridges 9h17 between K and 9x19 Steam, power 303 J and initial velocity 300 m / s. chuck length - 25 mm, sleeve length 17,7 mm. Cartridge weight - 10 g, Bullet weight - 6,5 g, mass of the charge - 0,32 g.
Modern firm "Gecko" cartridge with a pointed bullet has a muzzle energy 333 J and muzzle velocity 330 m / s. AT 1976 , a similar cartridge under the name of "Police" began producing firm "Hirntenberger". His bullet weight 6,5 grams has a muzzle energy of 339-363 and J. muzzle velocity 323-345 m / s.
The relatively low capacity cartridge can be used in pistols, equipment which operates on the principle of free slide recoil. The most widely he had received in the police.
The cartridge case of cylindrical shape, brass or steel. Bullet shell with lead core, or ogive has a tapered flat head portion (that changes its ballistic properties, including initial velocity).
Despite the apparent similarity to chuck 9x18 PM, they are not interchangeable, so as "Ultra" and "Policy" bullet caliber cartridges is 9,02 mm, a PM - 9,25 mm. Besides, PM chuck sleeve in the diameter 0,5 mm longer, than that of the cartridge "Ultra" ("Policy"). However, the presence of "Ultra" PM pistol and bullets can shoot them, charging a pistol on one cartridge, wrapping his wide strip of adhesive tape 19 mm (capturing a bullet 1-1.5 mm) and, bringing, in this way, diameter up to 10 mm.
conversely, in the presence of a pistol chambered for "Ultra" and the PM bullets shooting possible, If the sweep diameter 10 mm to increase the diameter of the chamber to a depth 18 mm end mill (also 10 mm) - the size of the cup for placing the shutter sleeve flange. Besides, necessary to slightly dissolve in hand bends shop throat.
However, this increases the load on the barrel, which leads to rapid wear of his, because of the larger diameter bullet cartridge PM is not only to crash into the rifling of the barrel when moving, but also extend due to transverse strain. Besides, may utykanie nedos next cartridge or due to different ballistic characteristics cartridges "Ultra" and PM.
