.50: AP, M2 AND CARTRIDGE, CAL. This may preclude moving the bipod. The second ammunition bearer retrieves the aiming posts. He must ensure that the ball-shaped end of the locking rod is secured in its recess by the locking latch. Then he relocks the barrel clamp. (3) The circlip is correctly located, securing the rotating socket to the baseplate. If not, the cartridge is placed on its side, and the closing plug is removed using an M18 fuze wrench. The squad leader indicates the direction of fire when mounting.
Army Publishing Directorate - Firing Tables It is especially useful if the baseplate sinks deep into the ground during prolonged firing. Increments removed from cartridges before firing should be placed in a metal or wooden container located outside the firing vehicle/position at least 25 meters away. However, since explosives are affected by moisture and high temperature, they must be protected.
81mm Roll Controlled Guided Mortar (RCGM) - General Dynamics Ordnance a. The platoon leader commands the platoon and supervises the training of the elements. Proximity-fuzed short cartridges, which are duds, contain a complete explosive train and impact element. If water is not available, the gunner must stand clear of the mortar until the barrel is cool. (c) The gunner determines mask and overhead clearance by sighting along the barrel with his eye near the breech plug. 81mm smoothbore mortar Barrel length 1.28 m Muzzle velocity 225 m/s Elevation +45 to +85 Traverse 18 Fire control Sights C2 indirect fire sight with illumination Firepower Rate of fire 20 rpm maximum 15 rpm normal 1 to 12 rpm sustained Range 5.650 m maximum 100 m minimum Media 81mm L16A2 b. It engages the 1 3/4-inch flats on the setting ring or the fuze head. b. Correctly applying and performing these duties enables the mortar section to perform as an effective fighting team. After the bands are broken and the box opened, the rounds should be removed by allowing them to roll out along the lid of the box (Figure 4-8). The company level vehicles also carry a vehicle-mounted 120mm mortar, which is augmented by the 60mm M224 mortar for dismounted use. The fuze threads and fuze well threads are inspected for damage. (4) The bipod locking latch is locked, securing the barrel clamps. Features: The M252 81mm Medium Extended Range Mortar is a crew-served, medium weight mortar which is highly accurate and provides for a greater range (4,500 meters to 5,650 meters) and lethality than the previous 81mm mortar. In addition to supervising the emplacement, laying, and firing of the mortar, he supervises all other squad activities. DESCRIPTION. An 81 mm mortar is a medium-weight mortar. The types of fuzes described in this paragraph are point detonating, proximity, mechanical time, multioption, and dummy. The muzzle end has a short tapered lead-in which acts as a . .30 BROWNING, M1917 AND M1917A1; GUN, MACHINE, CAL. Propelling charges are covered or protected from dampness or heat. If the primer is not dented, the round may be used again. d. The squad leader supervises the squad drill and is responsible for supervising the laying out of the equipment as shown in Figure 4-6. The fuze is set manually to proximity, point detonate, or delay modes. The gunner places the outer edge of the baseplate against the baseplate stake so that the left edge of the cutaway portion of the baseplate is aligned with the right edge of the stake (Figure 4-7). The M853 cartridge (M252 only) has a cylindrical body that contains an illuminating candle and parachute assembly. d. The first ammunition bearer stands to the right rear of the mortar. Tabular Firing Tables TFT ORDER FORM 1.Select "Mortar" 2.Select which mortar caliber 3.Select mortar system nomenclature 4.Select which TFTs to order 5.Put in quantity and click "Add TFTs" 6.Click "Next" TFT JUSTIFICATION 1.Put in TFT Ordering Justification 2.Click "Next" SHIPPING INFORMATION 1.Fill out all required fields SMALL DEFLECTION AND ELEVATION CHANGES. The bipod provides front support for the barrel and carries the gears necessary to lay the mortar. e. The M362A1 and M362 HE cartridges are of steel forge construction and contain about 2.10 pounds of composition B explosive. The pile is covered with a double thickness of tarpaulin. When cartridges have been prepared for firing, but are not used, all powder increments and safety wires are replaced. If not, he may still fire at the desired range by selecting a charge zone having a higher elevation. It is used for records such as reports on condition, malfunctions, and accidents. There is a selector on the lower shaft for non-delay or delay impact action. The assistant gunner cleans the bore and swabs it dry. 0.50, M8 (REPRINTED W/BASIC INCL C1-2) (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR MACHINE GUN, CALIBER .50: BROWNING, M2 (HEAVY BARREL, TURRET TYPE) ON MOUNT, MACHINE GUN, TRAILER MOUNTED: MULTIPLE CALIBER .50 MACHINE GUN, M55 FIRING CARTRIDGE, CALIBER .50: API, M8 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR MACHINE GUN, CALIBER .50: FICED, M85 TANK, COMBAT, FULL TRACKED: 105MM GUN, M60 SERIES FIRING CARTRIDGE, CALIBER .50: API, M8 CARTRIDGE, CALIBER .50: API-T M20 CARTRIDGE, CALIBER .50: BALL, M33 CARTRIDGE, CALIBER .50: TRACER, M17 (S&I BY PROP SEE DETAILS, FOOTNOTES), MACHINE GUN, CAL. The fuze wrench, M18, assembles the fuze to the cartridge, and the bladed tip on the end sets PD-type fuzes. Both legs are fitted with a disk-shaped foot with a spike beneath to prevent the mount from slipping. c. The moisture-resistant seal of the container is broken when the ammunition is to be used. The components of the mortar consist of a cannon, mount, and baseplate. Table 4-2. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 The fuze should already be fitted to the cartridge. ), FIRING TABLES FOR, CANNON, 155MM, HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A1B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A4 AND CANNON, 155MM, HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A5 AND HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, 109A6 AND CANNON, 155MM, HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM, HOWITZER, XM776 ON HOWITZER, MEDIUM, TOWED, 155MM, XM777 FIRING PROJECTILE, HE, M795 (S&I BY PROP SEE DETAILS, FOOTNOTES), FIRING TABLES FOR CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5, M109A6 AND M109A7 AND CANNON, 155MM HOWITZER, M284A2 CHROME ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND M109A7 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777, M777A1 AND M777A2 AND CANNON, 155MM HOWITZER, M776 CHROME ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, SMOKE, WP, M1121 INCLUDES FIRING TABLES FOR PROPELLANTS: M119A2 (CHARGE 7R), M203A1 (CHARGE 8S), AND MODULAR ARTILLERY CHARGE SYSTEM (MACS) PROPELLANTS: M231 (CHARGES 1L AND 2L), M232 AND M232A1 (CHARGES 3H, 4H AND 5H) (S&I BY PROP SEE FOOTNOTES). The wrench (P/N 9349539) sets M772 MT and M768 time fuzes. Following the arm-and-hand signals of the gunner (who is looking through the sight unit), he moves the far aiming post so that the gunner obtains an aligned sight picture. . d. Climatic Effects. The assistant gunner places his right hand palm up (1 inch from the muzzle end) under the BAD and his left hand palm down (1 inch from the muzzle end) on top. As a longstanding partner of armed forces around the globe, Rheinmetall supplies a wide array of mortar systems and ammunition.
FM 23-90 Chptr 4 81-mm Mortar, M252 - GlobalSecurity.org a. a. Before-firing checks include the following: (1) Ammunition should be free of moisture, rust, and dirt. LHMBC. He tightens the leg-locking handwheel (ensuring the teeth are correctly meshed) and fastens the securing strap over the arm and around the buffers. (a) Since the mortar is normally mounted in defilade, there could be a mask such as a hill, tree, building, or rise in the ground. Long Range PGK. A plain leg is fitted to a stud on the elevating leg and is secured by a leg-locking handwheel. The cartridges are returned to their original containers. The mortar also offered the promised increase in range as well, allowing fire teams to engage the enemy at distance. The tabulated data of the 81-mm mortar, M252, are shown in Table 4-1. 81-mm MORTAR, M252 The 81-mm mortar, M252, delivers timely, accurate fires to meet the . f. Ammunition should be stored under cover. Excess increments should not accumulate near the mortar positions but are removed to a designated place of burning and destroyed. I have included my order history, detailed photos, as well as my personal opinion on International Military Antiques, IMA -USA www.ima-usa.com 81mm Display Mortar that they have for sale. MC Medical Guide; Client-side mods; TFAR 1.x for players; If the barrel is hot, the gunner may then apply water to the outside of the barrel until it is cool. Disposal Precautions. The RSTA squadron only receives the 120mm mounted mortar, there is no augmentation dismounted maneuvers. M327 mortar is an extended range mortar system operated by Marine Corps Artillery Units. The gunner stands to the left side of the mortar where he can manipulate the sight, elevating handwheel, and traversing handwheel. Several types of HE ammunition are used in the 81-mm mortar, M252. (1) Mask clearance and overhead clearance are sufficient. He places firing data on the sight and lays the mortar for deflection and elevation. FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self propelled M125A1 and M125 Carrier, 81mm Mortar Tracked XM755 [US Army.] (The handle of the wrench is turned counterclockwise.) (4) The M567 fuze is an impact fuze that has a SQ/IMP or D function. HE ammunition is used against personnel and materiel. The fuze consists of a brass head, body assembly, and expelling charge. During training, the gunner may use the driving stake from the aiming post case. This section discusses the characteristics and nomenclature of each component (Figure 4-2). The 81mm mortar is a portable, mobile, medium mortar at the infantry's disposal.
Mortar Weapon Systems - USAASC Safety before firing is provided by a safety wire, which must be removed just before firing. The gunner can depress the barrel, if necessary, to provide easier access to the firing pin. If the mortar section is to operate quickly and effectively in accomplishing its mission, mortar squad members must be proficient in individually assigned duties. The squad leader notifies the FDC of the minimum mask clearance elevation. The fuzes may be used for day or night operations. This section contains information on how to prepare the 81-mm mortar, M252, for firing, how to conduct safety checks, and, if a misfire should occur during firing, what actions the crew applies to remove the cartridge from the barrel. The M821 HE cartridge (M252 only) is a British-made cartridge fitted with the US M734 multioption fuze. Proximity fuzes withstand normal handling without danger of detonation or damage when in their original packing containers or when assembled to projectiles in their packing containers. c. The assistant gunner disengages the barrel clamps and moves the bipod from the immediate area of the mortar position. The cartridge weighs about 9.12 pounds. Proximity (VT). e. The squad leader picks up the aiming posts and sight. (2) The fin and fuze assembly must be checked for tightness and damage. Referring and realigning aiming posts ensure that all mortars are set on the same data. If the situation allows for a longer waiting period, the dud can be considered safe for handling after 40 hours. The gunner levels the elevation bubble by turning the elevation micrometer knob and reading the setting on the elevation scale and elevation micrometer--this setting is the minimum mask clearance. An air cavity can form on one side of a cartridge to unbalance it, causing instability in flight.
M252 81mm Medium Extended Range Mortar - Specifications Theme by TechDoc. (5) With the exception of a few unused increments (within the same ammunition lot number) as replacements for defective increments, excess powder should be removed from the mortar position. Army Publishing Directorate
The contents of ammunition containers are shown by markings. The M734 multioption fuze is the only one used with the 81-mm mortar. VERY NICE condition! (1) The rotating socket is free to move in a complete circle.
FM 23-90 Chptr 4 81-mm Mortar, M252 - GlobalSecurity.org (8) To help minimize the occurrence of short rounds and or duds, unpackaged ammunition that has been dropped should not be fired. Lock
b. It should be destroyed in accordance with standard procedures. A .mil website belongs to an official government organization in the United States. M3A1 Baseplate
This action breaks an internal sheet pin and internal wire, thereby disabling the proximity function. The propelling charge consists of an ignition cartridge and removable propellant increments. He maintains the ammunition for firing and provides local security for the mortar position.
PDF Principles of Fire Support B2c0289xq Student Handout He places the sight case and aiming posts to the left front of the mortar position. The removable increments are fitted onto or around the shaft, depending on their type.
a. Cartridges are shipped with a complete propelling charge, an ignition cartridge, and primer. (5) Four inches of elevation shaft are exposed, and the shaft is not bent. Figure 4-8. 81mm 120mm 60mm .
81MM SYSTEM | Hirtenberger Defense Systems In any case, the gunner must ensure that the cartridge does not strike an obstacle. A proximity fuze is an electronic device that detonates a projectile by means of radio waves sent out from a small radio set in the nose of the projectile. Figure 4-7. c. The elevating shaft is contained in the elevating leg; to the left of the elevating leg is the elevating handwheel. The safety wire must be removed before firing. 120MM Mortar System. Joint Tables of Allowance; PB - Professional Bulletins; STP - Soldier Training Publications; TC - Training Circulars; . The floating firing pin located within the primer has approximately 1/16 of an inch to move around. d. Multioption. Check the post SOP before applying the following procedure: (1) Select a place at least 100 meters from the mortar position, parked vehicles, and ammunition piles. To prepare for firing, the slot is aligned in the striker with SQ or delay using the M18 fuze wrench. g. The barrel clamps can be moved along the barrel to counter large changes in elevation. Types of rounds, classification, and characteristics for the 81-mm mortar, M29A1 (Standard B for the 81-mm mortar, M252). All elements given in the fire command are repeated by the squad.
PDF 81-mm MORTAR, M252 - GlobalSecurity.org The ammunition that can be fired by the 81-mm mortar, M252, is identified and described herein. Both the M90 and M90A1 propellants are in nine wax-tested, cotton cloth, bag increments assembled to the tail unit. (4) The blast attentuator device is secured correctly. This cartridge is ballistically matched to the M374A2, M374A1, and M375 HE cartridges, and weighs about 9.12 pounds. The cartridge is painted olive drab with yellow markings. M64A1 Sightunit.
60mm, 81mm, and 120mm Mortar Increments with Ball Powder Propellants Ammunition is made and packed to withstand all conditions ordinarily encountered in the field. There must not be a visible gap between the fuze and cartridge body. The fuze body is graduated from 0 to 50 seconds in 2-second intervals; 10-second intervals are indicated by bosses. The 0-second boss is wider and differs in shape from the other body bosses; the safe setting position is indicated by the letter "S" on the fuze body. High explosive--M821, M889, M374-series, and M362. A lock (
It is designed to be fired in the indirect fire mode, cannot be fired handheld, and normally utilizes a FDC. The cartridge uses the M218 propelling charge, which consists of four horseshoe-shaped increments fitted around the tail. b. (2) Color code. Finally, the assistant gunner loosens the leg-locking handwheel, presses the spring-loaded locating catch, and raises the plain leg behind the buffer cylinders until it touches the traversing handwheel. CANNON, 155MM HOWITZER, M185 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A1 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A1B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A2 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3 HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A3B HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A4 AND CANNON, 155MM HOWITZER, M284 ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A5, M109A6 AND M109A7 AND CANNON, 155MM HOWITZER, M284A2 CHROME ON HOWITZER, MEDIUM, SELF-PROPELLED, 155MM, M109A6 AND M109A7 AND CANNON, 155MM HOWITZER, M199 ON HOWITZER, MEDIUM, TOWED, 155MM, M198 AND CANNON, 155MM HOWITZER, M776 ON HOWITZER, MEDIUM, TOWED, 155MM, M777, M777A1 AND M777A2 AND CANNON, 155MM HOWITZER, M776 CHROME ON HOWITZER, MEDIUM, TOWED, 155MM, M777A2 FIRING PROJECTILE, HE, M795 PROJECTILE, HE, M795 IM PROJECTILE, HE, M1122 PROJECTILE, IR ILLUMINATING, M1123 PROJECTILE, ILLUMINATING, M1124 INCLUDES FIRING TABLES FOR PROPELLANTS: M119A2 (CHARGE 7R), M203A1 (CHARGE 8S), AND MODULAR ARTILLERY CHARGE SYSTEM (MACS) PROPELLANTS: M231 (CHARGES 1L AND 2L), M232 AND M232A1 (CHARGES 3H, 4H AND 5H) (S&I BY PROP SEE DETAILS, FOOTNOTES) . .30, BROWNING, M1919A4 AND M2 (HEAVY BARREL), .30, M2 (REPRINTED W/BASIC INCL C1) (S&I BY PROP SEE DETAILS, FOOTNOTES), GUN, MACHINE: CAL. The term "indirect fire" means firing at an enemy without having a. All mortar cartridges are painted to prevent rust and to identify their type. It is painted white with black markings. The leg-locking handwheel must then be tightened by hand, ensuring the teeth on either side are correctly meshed. .50 MACHINE GUN, M55 AND MACHINE GUN, CAL. The superior flow characteristics of these BALL POWDER . General Dynamics Ordnance and Tactical Systems' 81mm Roll Controlled Guided Mortar (RCGM) provides an affordable, flexible solution to meet that need. They are fuzed with the M524-series, M256-series, or M532. He positions the lower barrel clamp against the lower stop band on the barrel and secures the upper barrel clamp. With the mortar mounted and the sight installed, the gunner lays the sight on the two aiming posts (placed out 50 and 100 meters from the mortar) on a referred deflection of 2800 mils and an elevation of 1100 mils. MFCS Dismounted. The barrel clamps are then closed. The striker has been modified to be able to use German and Italian patterns of 81mm mortar . 9301 Chapek Road., Bldg.1458
He stands to the rear of the baseplate and supports the barrel until the bipod is fitted. The equipment is placed out the same as for the gunner's examination (Chapter 9). After the barrel cools, the gunner removes the sight and firing pin. Burst Height. If it is necessary to leave the ammunition uncovered, it should be raised on dunnage at least 6 inches above the ground. Official websites use .mil
In the U.S. Army and U.S. Marine Corps, it is normally deployed in the mortar platoon of an infantry battalion. The terms cannon and barrel are used interchangeably in this chapter.
The 81mm mortar rounds use Red Phosphorus as the smoke generating agent. (1) The M935 fuze has two function settings: impact and delay. The ignition cartridge has a percussion primer and is assembled to the end of the fin assembly. Cartridges assembled with the M532 fuze must be fired above charge 0.
M29, 81mm Mortar - Military Factory The M375A3 cartridge is ballistically similar to the M374A3 (HE) cartridge. The round is still safe to handle and transport if the safety wire is reinserted. Tabulated data. He has the duty of preparing the ammunition and passing it to the assistant gunner. With the mortar mounted and the sight installed, the gunner lays the sight on the two aiming posts (placed out 50 and 100 meters from the mortar) on a referred deflection of 2800 mils and an elevation of 1100 mils. A securing strap is attached to the plain leg for securing the bipod in the folded position. Red phosphorus/white phosphorus--M819 and M375-series. The cartridge is painted light green with black markings and one narrow brown band. 60MM M224A1. The sight is laid on two aiming posts (placed out 50 and 100 meters from the mortar) on a referred deflection of 2800 mils and an elevation of 1100 mils. An official website of the United States government. The round has a burst height of 600 meters and provides illumination for about 60 seconds for an area of about 1,200 meters. (1) Marking on container. He ensures that the firing pin recess is facing upwards. When the fuze of the misfired round reaches the BAD, the assistant gunner stops the round with his thumbs (he does not touch the fuze) and carefully removes it from the barrel. The 81-mm mortar, M252, is a smooth-bore, muzzle-loaded, high-angle-of-fire weapon. b.
[Firing and Deflection Conversion Tables] - The Portal to Texas History He lays for deflection, taking the proper sight picture. b. Remaining increments are repositioned towards the rear of the tail fin assembly when firing the cartridge with horseshoe-shaped increments at less than full charge. Other armies count on 81mm mortar families. The entire squad stays with the mortar. The 81mm weapons platoon consisted of the headquarters platoon and four mortar squads. To dismount the mortar, the squad leader commands, OUT OF ACTION. (2) The M524-series fuze has two function settings: superquick/impact (SQ/IMP) and delay.
PDF Principles of Fire Support B2c0289xq Student Handout In charge was the platoon commander - normally a lieutenant. The mortar is mounted and the sight is installed. Illuminating is used for battlefield illumination and signaling. Baseplate placed against baseplate stake. The M532 fuze is a radio doppler fuze that has a proximity (PROX) or SQ/IMP function. The explosive elements in primers and fuzes are sensitive to shock and high temperature. During firing, the breech plug on the barrel is sealed and locked to the rotatable socket in the baseplate. For those of you in the market for a Dummy/Display 81mm mortar, I hope this article can answer a few of your questions before you order.
Fuze, PD, for 81mm mortar rounds, Italy, WWII, inert (3) The M256-series fuze has an SQ/IMP function only. The gunner is given a deflection change in a fire command between 20 and 60 mils inclusive. Training practice--M879, M880, M68, and sabot. Close approach to crests, trees, towers, large buildings, parked aircraft, mechanized equipment, and similar irregularities causes functioning at heights greater than average level. The mortar is then re-laid on the aiming posts using the traversing crank. The M375 cartridge uses the M90 propelling charge while the M375A2 and M375A1 cartridges use the M90A1 propelling charge. (3) The M84A1 fuze is a single-purpose, tungsten-ring, mechanical-time fuze used with the 81-mm M301A3 illumination cartridge. The gunner places the announced deflection on the sight (without disturbing the lay of the weapon) and looks through the sightunit. f. The open end of the socket must continue to point in the direction of fire.
50mm? 60mm? 80mm? A guide on picking the right mortar for you M821/M889 81mm HE Mortar Cartridges - GlobalSecurity.org To convert the fuze from PROX to SQ/IMP, the top of the fuze must be rotated 120 degrees (one-third turn) in either direction. . Trenches are dug to prevent water from flowing under the pile. Each squad member should be able to perform all the following premount checks: a. The first ammunition bearer holds the barrel until the assistant gunner has removed the mount. The gunner is given a deflection and elevation change in a fire command causing the gunner to shift the mortar between 200 and 300 mils for deflection and between 100 and 200 for elevation. At the muzzle end is a cone-shaped blast attenuator device (BAD) that is fitted to reduce noise. It can be set from 3 to 55 seconds at half-second intervals. With standard mortar, the maximum effective range is close to 4,000 metres; with a long-range system, this increases to nearly 4,500 metres. 107 Army Pentagon
FT 81-AI-3 Firing Tables Mortar, 81mm: M28A1 and M29 Mortar 81mm Self Identification. The M821/M889 are 81mm HE Mortar Cartridges. If the round fires, the mortar is re-laid on the aiming point and firing is continued. Washington DC 20310-0107, ADRP - Army Doctrine References Publications, ATTP - Army Tactics, Techniques, and Procedures, FY Publication Status Report (CAC required for access), Publishing Resources (CAC required for access), PC/PCO/FMO/EPCO Directory (CAC required for access), usarmy.pentagon.hqda-apd.mbx.customer-service@army.mil, GUN, MACHINE, CAL. b. It uses the M185 propelling charge that consists of eight increments fitted into the spaces between the fins and held by a propellant holder. The fuze arms and functions normally when fired at any angle of elevation between 0800 and 1406 mils at charges 1 through 9.