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MIL-C-46409D (AR)
APPENDIX "D" (CONT'D) In order that the propellant shall be uniformly position from cartridge to cartridge,
attention to detail is position from cartridge to cartridge, attention to detail is necessary in
handling and cambering the cartridge. The cartridge shall first be held vertically, bullet upward,
and then rotated slowly, end over end in a vertical plane, stopping the rotation momentarily after
180 of rotation when the bullet is downward, and then continuing through the remainder of 360
stopping with the cartridge again bullet-end upward. The bullet-end of the cartridge should now
be lowered slowly to a position slightly above horizontal, The cartridge shall be chambered very
carefully, taking care that the primer-end of the case is not elevated above the bullet-end. (The
object is to have the cartridge seated in the chamber ready to fire, with the propellant in a loose
condition at the primer-end of the ease). The breech-block shall be closed gently. If the technician encounters any difficulty
closing the breech-block or engaging the trip lever, the test shall be discontinued until such
difficulty is corrected. If any delay should occur after the cartridge is placed in the chamber and
the duration of the delay is approximately 30 seconds or longer, that cartridge shall be extracted
and another inserted in its place. The technician makes a final check to assure that the anvil is screwed to a snug
position on the copper cylinder. Care is taken to see that the copper cylinder is not compressed
by the anvil prior to firing. The proper torque to be applied to the thumscrew is about on pound-
inch. (The torque can be estimated with satisfactory accuracy by an experienced technician; to
familiarize inexperienced technicians with the desire degree of tightness, a torque measuring
device may be employed. This can be accomplished by drilling and tapping (threading) an axial
hole in the knurled head of the anvil (thumb-screw) and inserting a bolt or screw to which a
torque-measuring wrench can be attached. The usefulness of the anvil (thumb-screw) is not
impaired by this modification). The trip lever, to which the lanyard is attached, shall be engaged gently to the
hammer. The technician retires to a safe position and pulls the lanyard with a smooth firm
motion. The velocity of the shot shall be recorded by the chronographer. The breech-block shall be opened, the fired case extracted and visually examined
by the technician for possible case casualties. The copper cylinder shall be removed and placed
in the recessed holding block. (Because the same obturating cup is used to fire twenty-two (22)
cartridges, it is not necessary to remove either the obturating cup or type piston from the piston
hole from shot to shot). The piston is then pressed down in the piston hole to is correct final
position; this can be accomplished by gently tapping the head of the piston with the knockout
tool or by placing a copper cylinder on the head of the piston and screwing the anvil down on it
forcing the piston into its correct final position. The cylinder used for this purpose in the
removed from the head o the piston and replaced with the next cylinder in the recessed holding
block. The anvil shall be screwed down lightly on the cylinder, using thumb and forefinger, but
not under stress. The chamber and bore of the test weapon are checked for obstructions. The procedure as specified in through is repeated until the twenty-
two (22) cartridges have been fired.

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