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Appendix "C" Velocity Test Procedure |
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|  MIL-C-46409D (AR)
APPENDIX "C"
VELOCITY TEST PROCEDURE
10.0 PURPOSE
The Velocity Test is a precisely controlled test to determine the velocity uniformity and level
of the ammunition lot under test.
20.0 EQUIPMENT
20.1 Equipment listed in the Velocity section of the appropriate Inspection Equipment List
shall be used.
20.2 The firing range shall be arranged as shown on Figure C-1
20.3 Pier of mount of solid construction on which the test fixture assembly shall be mounted
30.0 USE OF STANDARD (REFERENCE) CARTRIDGES
30.1 Standard (reference) cartridges shall be used to establish range and equipment
corrections prior to firing an ammunition lot for acceptance. One standard (reference) cartridge
shall be fired for each cartridge of the test sample to be fired, up to twenty (20) cartridges. When
the test consists of more than twenty (20) but not more than forty (40) cartridges, then twenty
(20) standard (reference) cartridges shall be fired. When the test consists of more than forty (40)
cartridges, then one standard (reference) cartridge shall be fired for every two (2) test cartridges.
30.2 After the required number of standards (reference) cartridges have been fired, the
actual average velocity if the standard (reference) cartridges shall be compared with the assessed
value. If the assessed value is higher than the actual average velocity of the standards (reference)
cartridges, the difference is a plus correction and shall be added to the average velocity of the test
cartridges. If the assessed value is lower than the actual average velocity of the standard
(reference) cartridges, the difference is a minus correction and shall be subtracted from the
average velocity if the test cartridges. If the assessed value and the actual average velocity of the
standard (reference) cartridges are identical, then no correction is applied.
30.3 The velocity-barrel assembly will be acceptable provided the results obtained with the
standard (reference) cartridges are within 35 feet-per-second of the assessed value.
30.4 It is suggested that control charts shall be maintained for record purposes, of the results
from each barrel in which standards (reference) cartridges are fired. Every corrrection obtained
shall be compared with the previous one to determine whether the test conditions remain stable
to a certain degree.
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