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Page Title:
Velocity, pressure, and waterproofness. |
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|  MIL-C-70784(AR)
4.4.4 Velocity, pressure, and waterproofness. The methods of
tests shall be as Prescribed in AS12013566. A total of three
Ten (10) rounds
barrels shall be utilized for EPVAT testing.
shall be fired through each barrel on day one. An additional ten
(10), rounds shall be fired through each barrel 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 0.19
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
Ten (10) rounds shall be fired through
for dispersion testing.
An additional ten (10) rounds shall be
each barrel on day one.
fired through each barrel on day two. No discards are allowed.
All groups shall be pooled together for the final dispersion
value. The measurements of targets shall be as prescribed in
The range shall be 200 meters.
AS12013566.
time. The method of test shall be as prescribed
4.4.6 Action
in AS12013566.
The method of test shall be as
4.4.7 Function and casualty.
prescribed in AS12013566 The test sample shall be assembled in
belts and fired in bursts of 25 + 5 rounds in a 25mm gun at a rate
The weapon barrel shall be at
of 200 50 rounds per minute.
ambient temperature at beginning of test (see 4.3.4.1 and 4.3.4.2).
4.4.8 Projectile trace.
The method of test shall be as
prescribed in AS12013566.
Visual observation or photographic
witness of trace characteristics shall be made from suitable
position(s).
4.4.9 Defective weapon.
The test barrel shall be inspected
No Mann Barrel which has had more than 5000
prior to testing.
rounds fired through it should be used.
4.5 In-process
controls.
4.5.1
Propellant charge establishment. A total of thirty
(30) cartridges shall be assembled with reference components and
Ten (10) cartridges each
utilizing the selected propellant lot.
shall be loaded with the nominal propellant charge weight, ten
(10) cartridges shall be loaded with one gram less than the
nominal weight and ten (10) cartridges shall be loaded with one
After conditioning the samples
gram more than the nominal weight.
at 21 3C for twelve (12) hours, the samples shall be
tested for velocity, pressure and action time using the EPVAT
The charge shall be selected that meets the specified
procedures.
requirements of 3.4, 3.5 and 3.8.
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