12.7 × 108 mm

Lore & Background

The 12.7×108mm cartridge was developed in the late 1930s (often cited as 1938) for the DShK heavy machine gun, not to emulate the German 13.2mm TuF anti-tank rifle round or the American .50 Browning Machine Gun round. It is used in the same roles as the NATO .50 BMG (12.7×99mm NATO) cartridge, though the two differ in bullet shape and weight, and the casing of the 12.7×108mm is slightly longer, with larger case capacity allowing it to hold slightly more of a different type of powder. The cartridge can engage a wide variety of targets, destroying unarmored vehicles, penetrating lightly armored vehicles, and damaging external ancillary equipment on heavily armored vehicles such as tanks. It will also ignite gasoline, but claims of diesel fuel ignition via the experimental 'Avers' AP/I round as of 2019 are not supported by verifiable evidence from reliable sources.

Reader's Guide

The 12.7×108mm cartridge has been a mainstay of Soviet and allied militaries since its introduction in 1934, serving in heavy machine guns and anti-materiel rifles. Its development paralleled that of the American .50 BMG, but with distinct dimensions and performance characteristics. The cartridge's ability to penetrate 20 mm of NATO medium-hard RHA from 500 meters when fired from a DShKM, and its use in a wide array of weapons—from the DShK and NSV heavy machine guns to anti-materiel rifles like the KSVK and OSV-96—underscores its versatility. The introduction of specialized rounds, such as the B-32 armor-piercing incendiary and the experimental 'Avers' round for igniting diesel fuel, highlights its continued evolution. The cartridge remains in service with multiple nations, reflecting its enduring significance in heavy support and anti-materiel roles.

Did You Know?

• The 12.7×108mm cartridge was invented in 1934 to create a cartridge like the German 13.2mm TuF anti-tank rifle round and the American .50 Browning Machine Gun round.
• The B-32 armor-piercing incendiary bullet, first produced in 1936, penetrates 20 mm of NATO medium-hard RHA from 500 meters when fired from a DShKM.
• The 12.7×108mm cartridge has a case capacity of 22.72 ml (350 grains) H2O and can handle up to 360 MPa (52,213 psi) piezo pressure.
• Since 2019, an experimental 'Avers' AP/I round can ignite diesel fuel, in addition to gasoline.

Origins & Strategic Intent

The 12.7×108mm cartridge traces its roots to 1934, when Soviet designers set out to develop a heavy-caliber round capable of matching two formidable foreign threats: the German 13.2mm TuF anti-tank rifle projectile and the American .50 Browning Machine Gun round (12.7×99mm NATO). The resulting design shares the same 12.7mm bore diameter as its NATO counterpart but distinguishes itself through a slightly longer casing, a different bullet profile, and a larger internal volume—22.72 milliliters of water capacity—that permits a modestly greater charge of a different powder type. From its inception, the round was intended to fill the same tactical niche as the .50 BMG: a versatile heavy machine gun and anti-materiel projectile. Over the decades, it became the standard heavy-caliber cartridge of the former Soviet Union and its Warsaw Pact allies, and later found adoption in China, Iran, and North Korea, cementing its status as one of the most widely deployed large-bore military rounds of the twentieth and twenty-first centuries.

Battlefield Performance & Target Engagement

On the modern battlefield, the 12.7×108mm round is designed to engage an extraordinarily broad spectrum of targets. Against unarmored vehicles it delivers outright destruction, while against lightly armored platforms it achieves reliable penetration. Even against heavily armored vehicles such as tanks, the cartridge remains tactically valuable: it can damage critical external ancillary equipment including searchlights, radar antennas, radio transmitters, vision blocks, and engine compartment covers. Specific penetration figures illustrate its capability—the standard B-32 steel-cored armor-piercing bullet, fired from a DShKM heavy machine gun, will defeat 20 millimeters of NATO medium-hard rolled homogeneous armor at 500 meters, and the same projectile from an NSV-12.7 will penetrate 20 millimeters of 2P steel at 100 meters. The newer 12.7SN sniper round, introduced in the 2000s with a 59.2-gram hardened tool steel tip and lead body traveling near 800 meters per second, extends effective anti-armor range to 1,500 meters against light vehicles. Since 2019, an experimental "Avers" armor-piercing incendiary round has added the ability to ignite diesel fuel in addition to gasoline, broadening the round's anti-vehicle incendiary role.

Ammunition Lineage & Specialized Variants

Since its first iteration, the B-30 armor-piercing round of 1930 with its 49-gram hardened steel core, the 12.7×108mm family has spawned a remarkable array of specialized projectiles. The B-32, introduced in 1936 and named after the earlier 7.62×54mmR B-32 designation, became the workhorse steel-cored API round. During World War II, the BS-41 featured a 55.4-gram cemented carbide core and was produced in limited numbers for the PTRSh-41 Sholokhov anti-tank rifle. The BZT-44 added a brighter tracer to the API profile, later supplemented by the BZT-44M of 2002 with a subdued tracer for covert operations. The BZF-46 incorporated white phosphorus for aircraft machine gun use, while the MDZ provided an immediate-action incendiary for mixed belts. In 1972, the BS round introduced a VK8 cemented carbide core. Perhaps most innovative was the 12.7 1SL tandem cartridge of 1985, housing two bullets in a single case for helicopter use against soft targets. The 12.7SN sniper cartridge of the 2000s rounds out the modern lineup with a 59.2-gram projectile at approximately 800 m/s.

Global Weapons Ecosystem

The 12.7×108mm cartridge has generated an extensive and diverse weapons ecosystem spanning ground and air platforms across multiple nations. In the heavy machine gun category, it powers the DShK, the NSV, the Kord, the Afanasev A-12.7, the Berezin UB aircraft gun, the CS/LM5 Gatling, the M17G hatch gun, the Type 77, the QJC-88, QJZ-89, and QJZ-171 Chinese systems, the Zastava M02 Coyote and M87, the Yak-B Gatling, the Yu-12.7 aircraft gun, and the 6P62 handheld variant. The anti-materiel and anti-tank rifle segment is equally broad, encompassing the AMR-2, ČZW-127, Falcon OP96, Gepard, Golan S-01, KSVK, OSV-96, PDSHP, QBU-10, QBU-201, Snipex M, SVN-98, V-94, Vidhwansak, Zastava M93 Black Arrow, M12 Black Spear, and the Zijiang M99 and LR-2 series. This proliferation across the former Soviet Union, Warsaw Pact states, China, Iran, and North Korea underscores the cartridge's enduring role as a cornerstone of heavy-caliber military firepower.