MIL-DTL-60318C (AR)
TABLE VI. CHARGE WEIGHT ESTABLISHMENT FOR
CHARGE INCREMENTS 3-7
No. of
Type of
Zones
Charge Weight
Rounds
Round
7
Calibration
7
Service
7
Test
7
Estimated MP Propellant
4
Calibration
6
Service
4
Test
6
Estimated MP Propellant
4
Calibration
5
Service
4
Test
5
Estimated MP Propellant
7
Calibration
3
Service
7
Test
3
Estimated MP Propellant
4.5.3.2 Uniformity Series for zones 3-7 (Table VII). The propellant shall be
conditioned to 70°F plus or minus 2°F for at least 24 hours and shall be fired within five
minutes after removal from the conditioning chamber. Firing results at 70°F shall be
corrected to standard weapon/firing conditions (calibration round conditions). A seven
round uniformity series shall be fired at each zone as specified in Table VII. Combining
the data obtained from both charge weight establishment and uniformity series (70°F), a
correlation between velocity and charge weight shall be derived using linear regression
(excluding any valid outlier), and the charge weight shall be calculated which will yield
the service velocity as specified in Table I for each zones, 3, 4, 5, 6 and 7. The resultants
shall be the recommended charge weights for charge increments 3, 4, 5, 6 and 7.
TABLE VII. UNIFORMITY SERIES FOR MP PROPELLANT
No. of Rounds
Type of
Zone
Charge Weight
Round
7
Calibration
7
Service
7
Test
7
*
7
Test
3
*
7
Calibration
3
Service
* Zones 1 and 2 final recommended charge weights. Zones 3 to 7 as determined for MP
propellant from charge weight establishment.
4.5.3.2.1 Velocity standard deviation. If the product of the velocity standard
deviation times the factor (0.69) from the uniformity firing is greater than 3.8 for Zone 3,
or 3.4 for Zone 7, the lot shall be rejected. The following factors, using the 95 percent
upper confidence limit and n-1 degrees of freedom, make allowances for the probability
that a standard deviation from a smaller sample size (loss of data) exceeds the true
standard deviation by chance alone. (See 6.3 & 6.8)
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