MIL-PRF-48656B(AR)
TABLE VI Firing defects
Firing Defects
Acceptance
Rejection
1. Burst rim
0
1
2. Blown primer or battery cup
0
1
3. Wad or other obstruction remaining in bore
0
1
4. Blown base wad
0
1
5. Head pulled off
0
1
6. Head cut off
0
1
7. Dropped primer or battery cup
0
1
8. Misfire
0
1
9. Body cut off
0
1
10. Head split
1
2
11. Split knurl
1
2
12. Split mouth
1
2
13. Partial cut off
1
2
14. Rupture
1
2
15. Partial split
1
2
16. Head start
1
2
17. Bulged rim
1
2
18. Body split
1
2
19. Powder burns
1
2
20. Primer set back
1
2
21. Battery cup set back
1
2
22. Primer pierced
1
2
23. Primer punctured
1
2
24. Cumulative defects for 10 - 23
3
4
NOTE: For defects refer to MIL-STD-636, shotshell cartridges section, for firing defect standards.
4.4 Methods of inspection.
4.4.1 Primed case sensitivity verification. The primed case sensitivity testing shall be performed
as specified in SAAMI Technical Committee Manual Vol. IV Shotshell. Empty primed shotshell
cartridges shall be tested for primer sensitivity. Two-thirds of the sample shall be tested at a height of 12
inches and one-third of the sample shall be tested at a height of 2 inches. If one or more cartridge primers
fail at either height, the sample fails and a sensitivity rundown test shall be conducted. The sensitivity
rundown test shall consist of a 25 cartridge test at each 1 inch increment of height between 0 percent and
100 percent firing. If the average critical height (H) plus four standard deviations (4 sigma) exceeds 14
inches, or if the average critical height minus two standard deviations (2 sigma) is less than 1 inch, the lot
of cartridges shall be rejected. The average critical height (H) is defined as the mean height at which 50
percent of the primers being tested will fire.
4.4.2 Velocity verification. The velocity test shall be conducted in accordance with SAAMI
Technical Committee Manual Vol. IV Shotshell and ANSI/SAAMI Z299.2. The sample cartridges shall
be temperature conditioned as follows (unpackaged cartridges) for four hours minimum:
a. Ambient: 70 ± 10 degrees Fahrenheit
b. Hot: 125 ± 5 degrees Fahrenheit
c. Cold: -20 ± 5 degrees Fahrenheit
9
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