7.35×56mm

From Atlas
7.35×56mm
7.35mm rifle cartridge
TypeRifle
Place of origin Granzery
Production history
Designed1920
Produced1920–present
Specifications
Case typerimless, bottleneck
Bullet diameter.289 in (7.3 mm)
Neck diameter.323 in (8.2 mm)
Shoulder diameter.460 in (11.7 mm)
Base diameter.528 in (13.4 mm)
Rim diameter.517 in (13.1 mm)
Case length2.35 in (60 mm)
Overall length3.23 in (82 mm)
Case capacity72 gr H2O (4.7 cm3)
Rifling twist1 in 10" (254 mm)
Maximum CUP50,763 CUP

The .289 Grozyar (7.35×56mm) was a cartridge developed from the 8.35x56mm cartridge. After combat experience indicated that the 8.35mm round had excessive recoil for use in light machineguns or semi-automatic rifles, the Granzerian military requested a necked-down version of the 8.35mm round for use initially in automatic weapons. From 1920-1925 the round was developed, and was first used in the HM Arzenál G-26 light machine gun. After great initial success the 7.35x56mm round was later adopted as the standard full-power rifle cartridge, first appearing in the Kt.Kar35 rifle. It was adopted as the standardized full-power Axis Cartridge in 1994.

History[edit]

Subsequent developments[edit]

The base of the 7.35mm round also led to the development of an intermediate round in 1940, the 7.35×42mm M43 round.

Propellant development[edit]

The lack of a suitable propellant led to the design in 1922 of Improved Infantry Rifle Propellant (JGHK) tubular nitrocellulose smokeless powder, JGHK.15 as a replacement for cordite for the 7.35mm cartridge. In 1924 JGHK.15½ added 2% tin to JGHK.15 to reduce metal fouling from cupronickel-jacketed bullets. JGHK.4064 replaced both powders in 1935 and has been used since.