MIL-PRF-70775B (AR)
3. REQUIREMENTS
3.1 Design verification. When specified (see 6.2), a sample of M910 cartridges shall be subjected
to design verification in accordance with 4.2.
3.2 First article. When specified (see 6.2), a sample of M910 cartridges shall be subjected to first
article inspection in accordance with 4.3.
3.3 Conformance inspection. When specified (see 6.2), a sample of M910 cartridges shall be
subjected to conformance inspection in accordance with 4.4.
3.4 Interface and interoperability.
3.4.1 Weapon interface. The cartridge configuration shall conform to drawing 12556514.
3.4.2 Projectile torque. The projectile shall be capable of withstanding a minimum torque of 30
inch-pounds without rotational movement with respect to the cartridge case.
3.4.3 Projectile extraction. The tensile force necessary to extract the projectile from the cartridge
case shall be between 1800 and 3500 pounds inclusive.
3.4.4 Noise. The average peak sound pressure level (P, decibels) and pulse "B" duration (t,
milliseconds) shall be limited in intensity and duration such that the following equation can be satisfied
when measured 0.46 meter left of the weapon breech:
P - 6.64 [log (200/t)] < 167 dB
In addition, the pulse "B" duration shall not exceed 200 milliseconds.
3.4.5 Toxic fumes. The cartridge shall not produce toxic fumes (as defined in TOP 2-2-614) in
excess of the concentrations produced by fielded (control) M910 ammunition.
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3.4.6 Primer sensitivity. The mean critical height ( H ) plus five standard deviations for the
sample primers shall not exceed 19 inches. The mean critical height minus two standard deviations for the
sample primers shall not be less than 2 inches.
3.5 Operating requirements.
3.5.1 Chamber pressure. The average plus 3.0 standard deviations of chamber pressure shall not
exceed 454 MPa when the cartridge is conditioned at 21°C. The average plus 2.0 standard deviations shall
not exceed 496 MPa, with no individual value exceeding 496 MPa, when the cartridge is conditioned at -
46°C and 63°C.
3.5.2 Action time. The action time of the cartridge shall not exceed 6.0 milliseconds.
3.5.3 Function and casualty, metal parts security. The cartridge shall function without casualty
while maintaining metal parts security. Cartridges and subcomponent parts shall exhibit integrity during
weapon cycling, chambering, and in ballistic flight.
3.5.4 Dispersion. Both the pooled vertical and horizontal standard deviations of the sample
cartridges shall be no greater than 0.40 mils when fired from a Mann barrel and no greater than 0.65 mils
when fired at a rate of 100 shots per minute (spm) from an M242 autogun.
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