MIL-DTL-0048684B
4.5.7 Pull test of projectile. The cartridge shall be placed in an approved fixture
and the axial tension specified on the applicable drawing shall be applied. If the sample
fails the drawing requirement, the lot represented by the sample shall be rejected and set
aside for disposition in accordance with MIL-STD-1916, root cause determined and
corrective action taken. Cartridge case assemblies may be reused after undergoing a
Government approved rework provided the same crimping method is used. Projectile
assemblies if undamaged may be reused. The cartridge shall be pulled until separation
occurs and the data analyzed.
WARNING: This test is conducted on assemblies containing an explosive element. Test
barricades (where used), procedures and equipment shall have prior Government
approval.
4.5.8 Functioning tests. The tests shall be conducted at a Government approved
test facility. If new, the MK19, MOD III, Grenade Machine Gun and barrel shall have at
least forty (40) rounds fired on it prior to being used for the test. The distance to the
impact medium of coarse sand shall be 200 meters plus or minus 5 meters. The depth of
the sand shall be a minimum of 10 inches.
4.5.8.1 Single shot. The barrel selected for the test must be used throughout the
entire test. The rounds shall be conditioned at 70 ± 5º F for at least 8 hours and then fired
within 15 minutes of being removed from conditioning temperature. The cartridges shall
be fired single shot from a MK19, MOD III, Grenade Machine Gun at a rate not to
exceed ten (10) per minute. At least six (6) gun warmers shall be fired at the beginning of
the test. All six (6) warmers shall be fired within one (1) minute. Rake sand prior to
beginning of the test (each ammunition lot). Rake sand as required such that individual
impact craters do not overlap. Sand shall be raked after each function failure. If a round
falls outside the specified impact area, it shall be declared a "no test" for impact
functioning requirements but velocity measures shall still be used. The velocity shall be
measured at 30 feet from the muzzle of the launcher. If an approved radar system is not
used, then the monitoring devices and time recorders shall be a dual system setup for
recording two (2) separate readings that shall be within 3 feet per second of each other. If
the two readings differ by more than 3 feet per second (for a given shot), the results shall
be declared a no test and another round fired in its place. The number of "no test" rounds
shall be reported. "No test" rounds shall be reported as "no test" rounds outside the
impact area or "no test" for velocity reading. Report the approximate range to impact of
"no test" rounds. Results shall be calculated and recorded for mean velocity and standard
deviation (see 6.7). Observation shall be made for compliance with Table III.
4.5.8.2 Rapid fire. The cartridges shall be rapid fired from a MK19, MOD III,
Grenade Machine Gun mounted on the MK64 Mount and M3 Tripod. Firing shall be in
bursts of five (5) to ten (10) rounds. Rate of fire shall be documented. Observation shall
be made for compliance with Table III.
4.5.9 Verification of ammunition lot numbering. Visually verify that an
ammunition lot number has been applied to each lot as described in MIL.-STD-1168.
4.5.10 Inspection Equipment. The inspection equipment required to perform the
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