RWS centerfire rifle cartridges in calibre 8x57 JRS

RWS centerfire rifle cartridges in calibre 8x57 JRS

The 8x57 JRS is a first-class cartridge for combination guns, in particular for double-barrelled rifles. When used in double rifles, it obtains a very rapid shot sequence, because the barrel is not seriously misaligned with the first shot. 

Since there already was an 8x57 IR, the next logical step was to also create a cartridge with rim for break-open rifles in addition to the 8x57 IS with the stronger 8 mm bullets. Well, the 8x57 IRS is the rimmed version of the rimless 8x57 IS. It was introduced in 1905 as well. 

RWS RWS 8x57 JRS HMK 12,1g

Field of applications

Highly suitedHighly suitedHighly suited Red deer, Fallow deer, Wild boar, Chamois, Roe deer
Well qualifiedWell qualified Bear, Elk, Oryx
Suitable Badger, Fox
50m 100m 150m 200m 250m 300m
100m 50m 0.0 100m 150m -5.0 200m -16.0 250m -33.0 300m -59.0
MRD 157m 50m 1.0 100m 4.0 150m 1.0 200m -8.0 250m -23.0 300m -47.0
BC-Value: 0.326

Properties

Type of bullet: Leaded / Leadfree Leaded partial fragmentation bullet
Characteristics Highest performance - irrespective of distance and game weight
Grain Light
Preservation of the game's meat
Different
Stopping effect
Very high
Recoil
Medium
Penetration
Medium
Likeliness of exit hole
Certain
Cutting of hair at point of impact
No

Velocity

0m 50m 100m 150m 200m 250m 300m
mV [m/s] 0770 50726 100684 150643 200603 250565 300528

Energy

0m 50m 100m 150m 200m 250m 300m
mE [J] 03587 503189 1002831 1502501 2002200 2501931 3001687

RWS centerfire rifle cartridge with H-Mantel-bullet

Bullet RWS HMK
8x57 JRS

Special about this bullet is its famous H-groove, a predetermined breaking point in the shape of a constriction in the middle of the jacket. It assists the separation of the two projectile cores and is, along with other factors, responsible for the bullet´s dual effective system: the front part bursts very quickly after the impact in the game, produces strong fragments and transfers much energy. The cylindrical tail part separates at the H-groove, penetrates the body even if bones of strong animal are hit, and provides the desired exit hole.

RWS bullet H-Mantel deformation process
RWS hunting bullets deformation process HMK
Deformation process bullet H-Mantel
H-Mantel-bullet

Construction H-Mantel-bullet

 

  1. Geometrically optimized tail for highest precision
  2. Hard tail core for extreme penetration
  3. Softer tip core for controlled fragmentation and high effectiveness
  4. Copper hollow tip for faster response in the game's body
  5. H-shaped constriction for reliable part fragmentation
  6. Modified cannelure for an optimal seat of the bullet
  7. Progressively increasing jacket wall thickness for a mass-stable residual body and a sure bullet exit

Mode of action

Shot on a block of gelatine with a length of 35cm. Shot distance: 100 Meters. Caliber: .30-06

  1. Energy transfer on lightweight game (at 10 cm): 1.193 J
  2. Energy transfer on heavyweight game (at 15 cm): 1.927 J
  3. Total energy transfer: 3.141 J
  4. Maximum energy: 166 at 10 cm
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