MIL-C-60983C (PA)
4.5.7 Heat seal test of packing seals. -This test shall be
performed in accordance with MIL-P-116. Seals so tested shall not
be returned to the lot.
4.5.8 Specific gravity of the charge of ball and skirt loading
assembly. -The specific gravity of the composition B shall be
determined as follows:
Weigh the empty ball and skirt assembly in grams and record as
We. Fill the empty assembly with water at 75 degrees ± 2 degrees
F., weigh in grams and record the weight as Ww. Determine the
volume by subtracting We from Ww.
Load the assembly with Composition B, drill the fuze well cavity,
weigh in grams and record the weight as W1. Determine the charge
weight by subtracting We from W1. Calculate the specific gravity
as follows:
4.5.9 X-ray examination of ballistic samples. -The cartridge,
prior to forwarding to the proving ground, shall be subjected to
x-ray examination using approved x-ray equipment or any other
method satisfactory to the contracting Officer. This test is a
non-destructive test. Parts so tested may be returned to the lot.
4.5.10 Functioning. -This test shall be conducted at a Govern-
ment owned proving ground. The cartridge shall be fired from an
approved launcher-placed on an approved mount to impact at 200
meters minimum from the launcher on a six inch thick loose gravel
pad. The gravel used shall have a 1/2 inch maximum size. The
velocity shall be measured at 20 feet from the muzzle of the launcher
using two sets of screens, each set of screens having an electronic
counter. One set of screen shall be placed 14 and 26 feet from the
launcher and the other set 15 and 25 feet from the launcher. NOTE:
To insure that the chronographs display accurate time intervals
the ratio of the two times shall not differ from 1.200 by more
than plus or minus 0.005. If the ratio differs from 1.200 by more
than plus or minus 0.005, the velocity results for that round shall
be discarded and excluded from the calculation of mean velocity
and velocity standard deviation. (No more than eight (8) rounds
in a sample size of 144, or twelve (12) rounds in a sample size of
288 may be disregarded. If the applicable number of improper
ratios is exceeded, additional round(s) must be fired) Observation
shall be made and results recorded for functioning, mean velocity
and standard deviation (See 6.7).
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