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MIL-HDBK-1027/3B
2.1.3.1
Sheathing and Baffles.  Wild shots that do not hit the backstop may
occur on any range.  It is necessary to sheath the walls, Ceiling, and
possibly the floor to contain wild shots. The amount of protection is
dependent on the type of building construction. A suggested sheathing
material is two layers of 3/4-in. (19 mm) particleboard backed with one layer
of 3/8-in. (9.5 mm) plywood when the range is intended for .22 LR cal. rimfire
only.  Four layers of 3/4-in. particleboard backed with one layer of 3/8-in.
plywood is adequate if .45 ACP hardball is the cartridge used. All non-
bulletproof walls, ceilings, and possibly floor8 downrange must be either
sheathed with bullet-containing material or baffled to divert stray bullets
beck into the range.  Sheathing should be installed behind acoustic materiel.
Downrange projections such as pilasters or columns should be
minimized, or protected with sheet metal baffles placed at 30 to the line of
fire.  Downrange electrical and mechanical installations such as lights,
pipes, and ducts, shall be protected by sheet metal baffles which will divert
a stray bullet beck into the downrange area where its energy can be expended
toward or into the backstop.
Sheet metal baffles should be constructed of sheet metal covered
with plywood.  Wood covering tends to reduce ricochets and backsplatter. The
gauge or hardness of the metal required is dependent on the caliber to be used
and the angle at which the baffles are installed.  Ten or twelve gauge hot
rolled sheet metal is usually sufficient if the angle of fire is 30 degrees or
less.  Tests have shown that 10 gauge steel set at right angles to the firing
line and covered with 2 in. (50.8 mm) of soft wood will stop bullets up to .45
cal.  At 30 the stopping/deflecting effect would be greeter with less damage
to the baffle.  No metal should be placed at right angles to the line of fire
without adequate wood covering.
Bulletproof Materials.  Walls, floors, and roof construction must be
2.1.3.2
bulletproof.  Concrete masonry (gravel filled) or concrete walls, reinforced
concrete floors, and flat concrete slab construction for ceilings is the
preferred type of construction.  Other construction materials, if used, which
will not provide equivalent protection, and buildings of wood shall have
protective steel plates or sandwich panels in walls, floor, and ceiling. When
selecting materiels, consideration will be given to the requirements for
acoustic treatment, ventilation, lighting, target carrier mechanisms, and lead
dust clean up.
2.1.3.3 Ceilings.  Ceilings above firing line will be covered with a
protective shield suitable for the most powerful cartridge authorized for
range use.  Shield shall extend a minimum of 12 ft (3.66 m) in front of firing
line for all ranges and 3 ft (0.914 m) behind the firing line when occupied
rooms are above.  On existing ranges, the openings in this shield for
lighting, ventilation, and target carrier mechanism shall be kept to a
minimum.  The remainder of the ceiling from the and of the shield to the
bullet trap may be treated in the following ways:
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