8.5mm Mars
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.
8.5mm Mars
- Name
- 8.5mm Mars
- Field
- pistol cartridge
- Region
- United Kingdom
VALÉORINE Encyclopedia
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Documentary summary
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.
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Documentary evidence
Documentary basis
Authority files
wikidata · Q4644307 · wikipedia · 8.5mm Mars
In this article
Overview
Overview
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 bullet at 1400 ft/s. The Mars cartridges were publicized as the most powerful handgun cartridges through the early 20th century; but fewer than 100 pistols were made and manufacture ceased in 1907.
Key facts
Key facts
• Name — 8.5mm Mars • Origin — United Kingdom • Type — Pistol • Design Date — 1899 • Manufacturer — Kynoch • Is Si Specs — yes • Case Type — Rimless, bottleneck • Bullet — 8.41 • Neck — 9.10 • Shoulder — 10.60 • Base — 10.70 • Rim Dia — 10.40 • Rim Thick — 0.90 • Case Length — 26.00 • Length — 36.80 • Bw1 — 139 • Btype1 — FMJ • Vel1 — 1550 • En1 — 740 • Balsrc — Textbook of Automatic Pistols MUNICION.ORG
Definition
Definition
The following is established of the heading itself. Institutional cataloguing adds that 8.5mm Mars is classified as a pistol cartridge. Associated with United Kingdom.
Places
Named by the record
Places
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- United Kingdom
Catalogued output
Recorded examples
It is also recorded that 8.5mm Mars is recorded as a kind of pistol cartridge. Institutional cataloguing adds that 8.5mm Mars was manufactured by Kynoch.
Primary material
Documents and archives
reference work
- “8.5mm Mars”, English Wikipedia, consulted as further reading
Reputable secondary · Wikipedia
authority record
- Wikidata, structured authority record Q4644307: 8.5mm Mars
General reference · Wikidata
Notes from the source article
Cited by Wikipedia
Notes from the source article
These works are cited by the source article, in its own numbering. They are recorded as its citations, not as sources VALÉORINE has verified.
- 1.*Wilson, R. K. Textbook of Automatic Pistols, pp.236-237. Plantersville, SC: Small Arms Technical Publishing Company, 1943.
- 2.8.5x26 Mars / MUNICION.ORG
References
Citations
References
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reference work
Secondary witnessauthority record
General reference
Further particulars
Held on the record
Further particulars
Open the remaining particulars
This entry is compiled from 2 catalogued sources across 2 independent registers. The registers consulted are Wikipedia and Wikidata. Every statement above is held against the register that stated it; where the registers are silent, the entry is silent.
The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 17 August 2026.
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