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|  MIL-C-85122(AS)
3.4.1.1 Primer sealing. Each cartridge case primer shall be waterproofed by
application of purple lacquer (MIL-L-296), to the joint between the cartridge case
and primer. Purple lacquer shall be visible after application, and the 0.140-inch-
diameter at the center of the primer button shall remain free of lacquer.
3.4.1.2 Primer resistance. The electrical resistance, between the primer con-
tact button and the cartridge case, shall be within 1 kilohm minimum and 1.2 meg-
ohms maximum.
3.4.2 Propellant. The primed cartridge case shall be loaded with propellant
(MIL-P-81994) conditioned to room temperature. Care shall be exercised to main-
tain the loading room humidity at levels that will not alter the moisture content
of the propellant during the loading process. The exact charge weight shall be
within 5 grains of the assigned weight for the index of propellant being used
as determined by MIL-P-81994.
3.4.3 Projectile insertion. Projectile assemblies that meet the requirements
of MIL-P-85121 and other specifications effected by the appropriate data lists
(see l.2) shall be inserted into the cartridge case and crimped as required by the
applicable drawing. The crimping process shall be controlled to ensure that the
maximum pressure applied to the neck of the cartridge case shall not exceed
39,000 pounds per square inch (psi).
3.4.3.1 Projectile extraction. The minimum force required to extract the pro-
jectile from the cartridge after crimping shall be 1,300 pounds.
3.5 Performance.
3.5.1 Ballistics.
3.5.1.1 Velocity-pressure. Velocity and chamber pressure values shall be as
follows:
(a)
Average muzzle velocity, measured at 78 feet, shall be 3,320 50
feet per second (ft/sec) with a maximum standard deviation of 40
ft/sec.
(b)
Average peak pressure at 70 degrees Fahrenheit (F) shall not exceed
(with the exception of HPT and LPT cartridges) 58,000 psi copper
with a maximum standard deviation of 3,000 psi. (If a piezoelectric
transducer is used to measure pressure, the pressure measured is
converted to copper crusher gage pressure by dividing by 1.2.)
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