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|  MIL-C-46409D (AR)
APPENDIX "E" (CONT'D)
30.3.3.4 Location of Center of Impact. From P, measure along PB a distance, PD, equal to
Y and along PA measure a distance, PE, equal to X. At points E and D erect the respective
perpendiculars EC and DC to lines PA and PB. The intersection of these perpendiculars is the
Center of Impact of the target, C. Steps 30.3.3.1 and 30.3.3.4 inclusive, are illustrated in Figure
E-1.
30.3.3.5 Mean Radius (M.R.) From the Center of Impact, measure the distance to the center
of each shot-hole of the target Add these distances and divide by the number of shot-holes, the
result is the M.R. Figure E-2 illustrates this procedure.
30.3.3.6 If one of more shots miss the target in any ten shot series, the entire accuracy test
shall be considered invalid and refired at a larger target, as necessary to ensure hits.
40.0 RECORDING OF DATA
40.1 All tests results shall be recorded to the nearest one-tenth of an inch.
40.2 Test sheets shall show the following:
a. Results of all specified requirement.
b. Number of type of case casualties.
c. Misfires.
d. Stripped bullets.
40.3 The following test weapon data shall be recorded on the test sheets:
a. Receiver number.
b. Barrel Number
c. Total number of cartridges fired in barrel.
d. Headspace measurement.
40.4 FACTORS AFFECTING ACCURACY TESTS
40.4.1 The external factors should be controlled as closely as possible in order to obtain
results that are representative of the inherent accuracy of the ammunition.
40.4.2 The dimensions and condition of accuracy weapons, as well as the manner of placing
the weapon the rest, are of prime importance.
40.4.3 The technique of test can affect accuracy results. If reproducibility in the manner in
which the cartridges are handled, chambered and fired be poor, a larger Mean Diagonal or Mean
Radius is obtained than if the cartridges are tested in a uniform manner.
40.4.4 The temperature of the test barrel should be controlled so that the exposed metal
surface of the barrel does not become too hot to grasp with the bare hands (approximately 140
F), at which time the weapon shall be cooled to ambient temperature before the test is continued.
40
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