8.5mm Mars

8.5mm Mars
Type Pistol
Place of origin  United Kingdom
Production history
Designed 1899
Manufacturer Kynoch
Specifications
Case type Rimless, bottleneck
Bullet diameter 8.41 mm (0.331 in)
Neck diameter 9.10 mm (0.358 in)
Shoulder diameter 10.60 mm (0.417 in)
Base diameter 10.70 mm (0.421 in)
Rim diameter 10.40 mm (0.409 in)
Rim thickness 0.90 mm (0.035 in)
Case length 26.00 mm (1.024 in)
Overall length 36.80 mm (1.449 in)
Ballistic performance
Bullet mass/type Velocity Energy
139 gr (9 g) FMJ 1,550 ft/s (470 m/s) 740 ft·lbf (1,000 J)
Source(s): Textbook of Automatic Pistols [1]
MUNICION.ORG[2]

The 8.5mm Mars is an experimental centerfire pistol cartridge developed in the late 19th century based on necking down the .45 Mars Long case. The bullet has two deep cannelures, and the case is crimped into both. The case mouth is chamfered on the outside to fit flush into the forward cannelure. This elaborate bullet seating was necessary to withstand the violent feed mechanism of the Mars Automatic Pistol. The cartridge headspaces on the shoulder adjacent to the neck. The case has a thin rim and deep extractor groove in comparison to most rimless pistol cartridges. There was a very similar 9mm Mars cartridge firing a 156 gr (10.1 g; 0.36 oz) bullet at 1,400 ft/s (430 m/s). The Mars cartridges were publicized as the most powerful handgun cartridges through the early 20th century; but less than 100 pistols were made and manufacture ceased in 1907.[1]

See also

References

  1. 1 2
    • Wilson, R. K. Textbook of Automatic Pistols, pp.236-237. Plantersville, SC: Small Arms Technical Publishing Company, 1943.
  2. ↑ 8.5x26 Mars / MUNICION.ORG
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