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|  MIL-C-70785 (AR)
(10) rounds shall be fired through each barrrel on day two. The
mean shall be summed for all groups. If these values fail to meet
the applicable requirements, the lot shall be rejected. Statistics
necessary for testing of results against acceptance criteria shall
be computed (see 6.3). A correction factor of 0.46 mps per meter
shall be applied to the recorded velocity at the measured range to
obtain muzzle velocity. The waterproofness sample shall be fired
from one test barrel only.
4.4.5 Dispersion: A total of three barrels shall be utilized
for dispersion testing. Ten (10) rounds shall be fired through
each barrel on day one. An additional ten (10) rounds shall be
fired through each barrel on day two. No discards will be
allowed. All groups shall be pooled together for the final
dispersion value.
If this value fails to meet the requirements
for dispersion, the lot shall be rejected. The measurement of
targets shall be as prescribed in AS12013566. The range shall be
200 meters.
4.4.6 Action time.
The method of test shall be as prescribed
in AS12013566.
4.4.7
Projectile trace. The method of test shall. be as
in AS12013566. Visual observation(s) or photographic
prescribed
witness of
trace characteristics shall be made from suitable
position(s)
.
4.4.8 Function and casualty. The method of tests shall be as
prescribed in AS10213566. The test sample shall be assembled in
belts and fired in bursts or 25 + 5 rounds in a 25mm gun at a rate
of 200 50 rounds per minute. The weapon barrel shall be at
ambient temperature at beginning of test (see 4.3.4.1 and 4.3.4.2).
4.4.9 Defective weapon. The test barrel shall be inspected
prior to testing. No Mann Barrel which has had more than 5000
rounds fired through it should be used.
4.5. In-process controls.
4.5.1 Propellant charge establishment. A total of thirty
(30) cartridge shall be assembled with reference components and
utilizing the selected propellant lot. Ten (10) cartridges each
shall be loaded with the nominal propellant charge weight, ten
(10) cartridge shall be loaded with one gram less than the nominal
weight, and ten (10) cartridges shall be loaded with one gram more
than the nominal weight. After conditioning the samples at 21
3C for twelve (12) hours, the samples shall be tested for
velocity, pressure and action time using the EPVAT procedures.
The charge shall be selected that meets the specified
requirements of 3.4, 3.5 and 3.8.
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