MIL-PRF-71168A(AR)
M60, in the M240B with standard buffer, and in the M240B with
hydraulic buffer machine guns at a minimum cyclic rate of 500,
650 and 500 shots per minute respectively within the temperature
range of -20°C ± 1°C to 40°C ± 1°C.
3.5.6 Noise level. The noise level of the cartridges at
the gunner's ear position shall not exceed 164 decibels and the
duration shall not be less than 20 ms.
3.5.7 Bullet integrity. The bullet of the cartridge shall
not burst or fragment in the barrel or during its flight.
3.5.8 Target kill. When the target is hit, the projectile
shall mark the target sufficiently to indicate a target hit and
activate a standard target mechanism at a range of 100 meters.
3.5.9 Maximum range. The maximum range of the cartridge
(when fired at standard atmospheric conditions) shall be no
greater than 600 meters. All bullets of cartridges fired at the
maximum range shall impact the ground within a safety fan defined
as 5° to the left and 5° to the right of the line of fire.
3.5.10 Port pressure. The average port pressure of the
cartridges when conditioned for 6 to 12 hours at 21°C ± 1°C and
fired at that temperature, shall not be greater than 85 MPa and
shall not be less than 45 MPa.
3.5.11 Match/Time of flight. The trajectory of the
projectile shall match within ± 1 mil the service cartridge at a
range out to 100 meters from the muzzle.
3.5.12 Bullet extraction. The force required to separate
the bullet from the cartridge case shall not be less than 20.4Kg.
3.5.13 Chemical compatibility. The cartridge shall
maintain its function in the M60 and M240B machine gun after
exposure to commonly encountered chemicals in the field.
3.5.14 Explosive ordnance disposal (EOD). When specified
in the contract or purchase order (see 6.2), the cartridge shall
undergo an EOD disposal test during design verification by EOD
personnel in accordance with EOD procedures prescribed by Army TM
60A-1-1-31.
3.5.15 Trace visibility. During day and night firing, the
bullet of the trace cartridge shall be visible beginning at a
range of 15 meters from the muzzle and continue visible out to a
minimum range of 100 meters from the muzzle.
3.6 Ownership and support requirements. Each cartridge
shall possess the following life-cycle ownership characteristics.
3.6.1
Function and casualty.
The cartridge shall function
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