M712 Copperhead Interior Ballistics

TM 9-1025-200-12&P TM 9-1300-251-20 TM 9-1300-251-34 TM 9-1025-211-10 TM 43-0001-28-4 TM 43-0001-28-5 TM 43-0001-28-6 TM 43-0001-28-7 TM 43-0001-28-8 TM 43-0001-28-9 TM 43-0001-28-10 TM 9-2350-311-10 TM 9-2350-314-10

Type Classification:

STD MSR 11796005. Use:

sure. In addition, the plastic nose cone on the training projectile can be replaced if it becomes damaged or broken. The switch bracket with five code and time switches is also easily replaceable.

The projectile, 155mm: Training, M823 is an inert round which is not to be fired from the howitzer. It is designed to train the 155mm Howitzer weapon crews in handling the Cannon Launched Guided Projectile M712 (Copperhead) at crew level.


The training projectile M823 simulates the M712 in weight, center of gravity and external appearance. The M823 projectile consists of the following components:

a. The M712 projectile ogive (nose cone).

b. The M712 closure plug modified for easy removal and reassembly in connection with obturator replacement.

c. The plastic M712-type obturator.

d. A one-piece body assembly with five M712-type code and time switches mounted in a bracket located in the forward bourrelet. It also simulates, in appearance, the recessed fins and wings of the M712 round.

This projectile provides crew training in unpacking and repacking, setting the required time and code, ramming and extraction of the tactical projectile.

Provisions have been made to replace the obturator (should it become damaged from repeated use) by removing the projectile aft clo-


The training round M823 contains no explosive. It is designed to be reusable with little maintenance and is used for training the 155mm howitzer crew in the operation of the live M712 projectile. The procedures are as follows:

a. The projectile is unpackaged and inspected.

b. The code and time switches are set.

c. The projectile is rammed into the howitzer tube.

d. The projectile is extracted from the howitzer tube.

e. The projectile is repacked.

This training round simulates the M712 in all artillery unit activities except that no pro-pellant charges or other hazardous materials shall he used in training exercises with this item.

The Extractor:

The extractor tool is used to extract the projectiles M712 and M823 from the cannon tubes in Howitzers M109A1/A2IA3, M114A2, and the Ml 98. These howitzers have the cannon tubes M185, M1A2, and M199, respectively.

The extractor tool consists of a two-piece adjustable screw driven rod. An expansion ring on one end is designed to snap and lock into the base of the projectile. A ratchet driven drive nut is located on the opposite end of the rod just to the rear of a T-Bar striker which is designed to fit against the rear face of a 155mm breech. A ratchet is provided to turn the drive nut. In use, the tool is extended and inserted in the open chamber of a 155mm howitzer through the weapon breech until the forward end makes contact with the projectile base. The projectile is engaged and locked by a plying forward pressure to the extractor tool. The extractor drive nut is then turned by hand until the striker bar is against the breech ring face. The ratchet tool is then inserted in the drive nut and turned until the projectile is pulled free.

Tabulated Data:


Type Inert (training)

Weight 1381b

Outside diameter 6.1 in. (155mm)

Body material Aluminum

Color Bronze w/black markings

Weapon System Information:

Weapon Type Cannon Tube M109A1/A2/A3-SP-M185 M198-To wed-M 199 Mil 4A2-Towed-M 1A2

Charge propelling -Fuze

Firing temperature


One projectile per container; six containers per pallet (when delivered in quantity).

Container: Weight:

w/projectile 205.5 lb w/o projectile 67.5 lb

Length 61 in.

Width 11 in.

Height 11.375 in.

Color Forest green w/white markings

Pallet (unit load with contained projectiles and dunnage) 13581b

Cube 32 cu ft

DOT designation PROJECTILE -

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