MIL-DTL-1318C (AR)
Table VI. Function and casualty firing defect criteria
DRAWING NUMBER
CARTRIDGE, CALIBER .50,
7672165
TRACER, M17
Criteria
Classification
Defect Description
First Article
Lot Acceptance
First
Cumulative
Acc
Rej
Sample
Sample
Bullet in bore
0
1
0
1/
Critical
Misfire Vent hole missing or blocked
0
1
0
1/
Critical
Misfire (excluding 2 above)
0
1
1
2
Major
Primer defects:
a. Escape of gas through primer cap
6
7
7
15
Minor
other than d. below
b. Escape of gas around primer cap for
13
14
14
30
Major
more than 50% of periphery
0
1
0
1
Minor
c. Blown primer (Primer separates
from casehead and primer pocket is
grossly distorted) or Dropped
primer (Primer falls out of pocket
upon retraction of bolt)
d. Perforation in firing pin indent in
23
24
24
60
Major
primer cup
Case casualties 2/
a. Longitudinal split
(1) Upper body (J)
6
7
7
15
Major
(2) Body (K) extending to case base
0
1
1
2
Major
(3) To head (L)
0
1
0
1
Major
(4) Through head (M)
0
1
0
1
Major
(5) Neck or shoulder (I or S)
26
27
27
65
Minor
b. Circumferential rupture
(1) Partial neck, shoulder, or body
1
2
2
4
Major
(S, J, or K)
(2) Partial, head (L)
0
1
0
1
Major
(3) Complete
0
1
0
1
Major
Failure to extract
0
1
0
1
Major
0
1
0
1
Major
Weapon stoppage attributable to
Ammunition 3/
Stripping
0
1
0
1
Major
14
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