57mm Artillery and Tank Gun Projectiles
57mm Complete Round, Fixed, Frag, UO-271
This round is fired from the 57mm anti-tank guns M1941 and M1943 (ZIS-2). The KT-1 and KTM-1 fuzes are used with the O-271 fragmentation projectile of this round.
The UO-271 complete round, with an O-271U projectile using a KTM-1 fuze, is a variant of the illustrated round. It is fired from the same weapons. The O-271U projectile has one bourrelet, near the ogive, and two rotating bands; the O-271, as shown in the above illustration, has one rotating band and two bourrelets: one near the ogive, the other below the rotating band.
Except for these differences in their projectiles, and differences in markings, the complete rounds UO-271 and UO-271U are almost identical in external appearnace.
The UO-271 complete round, with an O-271U projectile using a KTM-1 fuze, is a variant of the illustrated round. It is fired from the same weapons. The O-271U projectile has one bourrelet, near the ogive, and two rotating bands; the O-271, as shown in the above illustration, has one rotating band and two bourrelets: one near the ogive, the other below the rotating band.
Except for these differences in their projectiles, and differences in markings, the complete rounds UO-271 and UO-271U are almost identical in external appearnace.
Characteristics
Caliber: 57mm (2.24 in)
Weight of complete round: 6.29kg (13.89 lbs)
Weight of projectile, as fired: 3.75kg (8.27 lbs)
Weight of propellant, w/o igniter: 0.21kg (0.46 lb)
Type of projectile filler: TNT
Weight of projectile filler: 0.2kg (0.45 lb)
Packaging
The illustrated container has a capacity of five rounds, with a gross weight of about 50kg (110 lbs). The rounds are packed in one level, and are held in place by contour blocking.
The gross weight may be shown on the side of the box, in the lower right-hand corner, by the marking: БРУТТО 50 КГ (Gross Weight 50kg).
57mm Complete Round, Fixed, AP-T, UBR-271
This round is fired from the 57mm anti-tank guns M1941 and M1943 (ZIS-2). It is used against tanks, various types of armored vehicles, and field fortifications. Its projectile contains a small base cavity filled with high-explosive.
The MD-5 fuze is used with the BR-271 armor-piercing tracer projectile in this round. It is possible, however, that this projectile also may be found with an MD-7 fuze.
The same complete round (with projectile BR-271 and fuze MD-5, as shown in the above drawing) has been found with the identification code UBZR-271 stenciled on the cartridge case. Although this code signifies an API-T complete round, analysis has disclosed that the projectile filling does not differ from that in the UBR-271 round.
The complete round UBR-271SP, with solid shot BR-271SP (which has a tracer assembly, but no explosive filler or fuze), is a variant of the illustrated round. It is fired from the same weapons and, except for differences in markings, it is almost identical with the UBR-271 in external appearance.
The MD-5 fuze is used with the BR-271 armor-piercing tracer projectile in this round. It is possible, however, that this projectile also may be found with an MD-7 fuze.
The same complete round (with projectile BR-271 and fuze MD-5, as shown in the above drawing) has been found with the identification code UBZR-271 stenciled on the cartridge case. Although this code signifies an API-T complete round, analysis has disclosed that the projectile filling does not differ from that in the UBR-271 round.
The complete round UBR-271SP, with solid shot BR-271SP (which has a tracer assembly, but no explosive filler or fuze), is a variant of the illustrated round. It is fired from the same weapons and, except for differences in markings, it is almost identical with the UBR-271 in external appearance.
Characteristisc
Caliber: 57mm (2.24 in)
Weight of complete round: 6.5kg (14.33 lbs)
Weight of projectile, as fired: 3.13kg (6.92 lbs)
Weight of propellant, w/o igniter: 1.5kg (3.3 lbs)
Type of projectile filler: RDX and Aluminum (74/22)
Weight of projectile filler: 0.018kg (0.04 lb)
Packaging
The illustrated container has a capacity of five rounds, with a gross weight of about 47kg (110 lbs). The rounds are packed in one level, and are held in place by contour blocking.
The gross weight may be shown on the side of the box, in the lower right-hand corner, by the marking: БРУТТО 47 КГ (Gross Weight 47kg).
This ammunition may also be found in a metal carrying case with a capacity of four rounds. The case has a carrying handle and is provided with suitable wooden cradles.
57mm Complete Round, Fixed, HVAP-T, UBR-271P
This round is fired from the 57mm anti-tank guns M1941 and M1943 (ZIS-2). When fired from either of these weapons, the round has virtually the same ballistic characteristics. It is used for direct fire against tanks, other types of armored vehicles, and field fortifications. It has a BR-271P high-velocity armor-piercing tracer projectile with a tungsten carbide core.
A windshield is threaded onto the forward end of the projectile body. The rotating band is mild steel, instead of copper. No fuze is used with the projectile in this round.
Note: Stamped numbers shown on the body of the projectile in the above illustration were taken from an actual projectile. They are believed to identify the projectile by manufacturing plant, lot number, and year of manufacture. A fourth number (possibly the smelt number) sometimes appears in the same line, or on the opposite side of the projectile. The identification code number which is stenciled on all other types of projectiles apparently does not appear on HVAP projectiles.
A windshield is threaded onto the forward end of the projectile body. The rotating band is mild steel, instead of copper. No fuze is used with the projectile in this round.
Note: Stamped numbers shown on the body of the projectile in the above illustration were taken from an actual projectile. They are believed to identify the projectile by manufacturing plant, lot number, and year of manufacture. A fourth number (possibly the smelt number) sometimes appears in the same line, or on the opposite side of the projectile. The identification code number which is stenciled on all other types of projectiles apparently does not appear on HVAP projectiles.
Characteristics
Caliber: 57mm (2.24 in)
Weight of complete round: 5.39kg (11.88 lbs)
Weight of projectile, as fired: 1.76kg (3.87 lbs)
Weight of propellant, w/o igniter: 1.7kg (3.75 lbs)
Type of projectile filler: Tungsten Carbide
Weight of projectile filler: 0.51kg (1.12 lbs)
Packaging
The illustrated container has a capacity of five rounds, with a gross weight of approximately 43kg (110 lbs). The rounds are packed in one level, and are held in place by contour blocking.
This ammunition also may be found in a metal carrying case with a capacity of four rounds. The case has a carrying handle and is provided with suitable wooden cradles.
The illustrated container has a capacity of five rounds, with a gross weight of approximately 43kg (110 lbs). The rounds are packed in one level, and are held in place by contour blocking.
This ammunition also may be found in a metal carrying case with a capacity of four rounds. The case has a carrying handle and is provided with suitable wooden cradles.
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