Description
This white bag propelling charge is used in 155mm howitzers for firing in Zones 3,4,5,6, and 7.
The total charge (M4A2 Prop. Charge) consists of 13 pounds of propellant and is divided between a base charge and four unequal increments loaded in white cloth bags. The increments are connected by four cloth tapes sewn to the base and tied on top of Increment 7. The igniter for Charge M4A2 is 3.5 ounces of clean burning igniter (CBI) in a red cloth pad sewn to the bottom of the base charge. A flash reducer pad containing one ounce of potassium nitrate or potassium sulphate is assembled at the front end of the base increment (Increment 3). The seams in the base pad are inverted so that the edges of the cloth are inward to reduce residue after firing.
Model M4A1 is similar to Model M4A2 except that the igniter charge is 3.0 ounces of black powder instead of CBI, the base charge seams are not inverted, and the charge does not include a flash reducer. Flash Reducer M2 may be used with Charge M4A1 when required, but is a separate item of issue.
Functioning
No information about functioning.
Hazardous Components
No information about hazardous components.
See Also
Propelling Charge, 155mm, M4A1
Source(s)
Iraq Ordnance Identification Guide (2004)
TM 43-0001-28, Artillery Ammunition (chg 11, 2003)
