Engineering:12.7×81mmSR

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The 12.7×81mmSR cartridge was created by Vickers as an export variant of the cartridge developed for the Vickers .50 machine gun. The major changes were to modify the case from rimless to Semi-Rimmed and reduce the bullet weight from 580 gr (38 g) to 565 gr (36.6 g).[1]

History

Vickers sold a number of weapons chambered in the cartridge to Italy and Japan, who developed their own weapons that utilized that cartridge.[2]



Alternate names

[3]

  • 12.7mm Breda
  • 12.7 x 81 SR
  • 12.7mm Type 1
  • 12.7mm Mod. 36
  • 12.7mm Japanese
  • .5 in. V/565 Vickers-Armstrong

Cartridge variants

[4][5][6]

  • Ball (full metal jacket), marked with a pink or red seal around the casemouth.
    12.7 × 81 mm ball
  • Armor piercing (AP) of Italian origin, marked with a black tip.
    12.7×81mmSR AP
  • Armour piercing tracer (AP-T) with red tracer, marked with a pink tip and green and white seal around the casemouth.
    12.7 × 81 mm HE, AP, tracer
  • AP-T with brighter-burning, longer-lasting red tracer, uncolored tip and black seal around the casemouth.
  • AP-T with white tracer, uncolored tip and green and white seal around the casemouth.
    12.7 × 81 mm tracer
  • Fuzed high-explosive incendiary (HEI) of Italian origin, its body painted blue or red. Contained 0.8 grams (12 gr) of PETN and incendiary composition.
    12.7 × 81 mm HE, tracer
  • Ma 103 fuzed HEI, marked with a white seal around the casemouth. Contained 0.8 grams (12 gr) of RDX and 1.46 grams (22.5 gr) incendiary composition.
  • Ma 102 fuzeless HEI, marked with a dark purple seal around the casemouth. Contained 2 grams (31 gr) of PETN + RDX and 1.46 grams (22.5 gr) incendiary composition.

See also

References

  1. ↑ ".5 Vickers Mk I Rimless" (in en). https://municion.org/producto/5-vickers-mk-i-rimless/. 
  2. ↑ "THE .5" VICKERS GUNS AND AMMUNITION" (in en). https://www.quarryhs.co.uk/Vickers.html. 
  3. ↑ "12.7 x 81 SR (v/565) - The Vickers Machine Gun" (in en). https://vickersmg.blog/the-guns/ammunition/12-7-x-81-sr-v-565/. 
  4. ↑ "Chapter 4". Japanese Explosive Ordinance (Army Ammunition Navy Ammunition). 2 (1 ed.). Washington, D.C, USA: United States Government Printing Office. 16 Mar 1953. p. 279. TM 9-1985-5/TO 39B-1A-12. 
  5. ↑ Japanese Ammunition - C.I.AMN. Technical Report. 24 (2 ed.). Khadki, India: Chief Inspector of Ammunition, Kirkee. 1945. pp. 3–4. 
  6. ↑ Japanese Ammunition 1880-1945 vol. 1, Ken Elks, ISBN 0955186226



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