MIL-DTL-45500E
boresight points. The boresight shall then be removed and a 75
or 100 round belt of target practice cartridges fired from the
gun. The target shall be checked to determine whether the
targeting and accuracy requirements have been met.
4.6.5.2 Range. Guns may be fired at a range of 1,000 to
3,000 inches provided that suitable correlations, approved by the
contracting officer, are made. In addition, if the contractor's
range facilities permit, this test shall be fired as part of the
functioning test (see 4.6.4).
4.6.6
Endurance test.
4.6.6.1 Mount. Unless otherwise specified, guns shall be
tested with the gun held in a Government approved mount in
accordance with 4.5.5.3.
4.6.6.2 Firing. All guns shall be fired in a series of
approximately 1000 rounds using five (5) burst of 200 + 10 rounds
each; except the M197 and M197E1 guns shall be fired in a series
of approximately 500 rounds using five (5) bursts of 100 + 5
rounds each. The performance requirements of Table I, (as
specified on the applicable specification sheet), shall be
measured and recorded for the last burst using instrumentation in
accordance with 4.5.5.4 and the applicable specification sheet.
4.6.6.3
Procedures.
4.6.6.3.1 Cooling. After each burst the gun shall be
allowed to cool for approximately 35 seconds. After each five
burst series the gun shall be cooled to within 25oF of room
temperature (using cooling aids other than water).
4.6.6.3.2 Cleaning and lubrication. Cleaning and
lubrication procedures will be implemented in accordance with the
appropriate operational level Technical Manual (see 6.3) during
the endurance test. At the end of each day's firing, the gun
shall be cleaned and protected against corrosion.
4.6.6.3.3 Barrels. Barrels may be alternated with a spare
set of barrels to expedite cooling. To preclude barrel rupture,
additional barrel sets may be utilized, as needed, to limit
erosion of any barrel in a set to 0.035 inch maximum.
4.6.6.3.4 Measurements and maintenance. After each 15,000
rounds fired the gun shall be disassembled as necessary for
maintenance and to replace parts in accordance with the appropriate
gun technical manual. Parts removed from the gun during inspection
shall be replaced in original positions from which they are removed.
Headspace, and firing pin protrusion, and (M197 and M197E1 guns
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