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M795 projectile

The M795 projectile is a 155-millimeter high-explosive artillery round employed as the standard bursting munition by the United States Army and Marine Corps in howitzer systems such as the M198 and M777.^[1] Featuring a high-fragmentation steel (HF1) body weighing approximately 103 pounds total, it contains 23.8 pounds of TNT explosive filler—though variants incorporate insensitive munitions compositions like IMX-101 for enhanced safety—and a gilded metal rotating band for rifling engagement and spin stabilization.^[2]^[1] Designed as an upgrade over the earlier M107 projectile, the M795 prioritizes superior fragmentation lethality against personnel and light materiel targets through its pre-notched steel casing, enabling effective indirect fire support at ranges up to 40 kilometers when paired with compatible propellants and fuzes.^[1] Introduced in the late 1990s to address fragmentation deficiencies in legacy rounds, the M795 has become the backbone of U.S. conventional artillery inventories, produced by contractors including General Dynamics Ordnance and Tactical Systems, with ongoing qualifications for insensitive munitions compliance to mitigate cook-off risks in combat storage.^[2] Its ballistic compatibility with existing 155mm systems ensures seamless integration, while fuze options—including point-detonating, proximity, and course-correcting variants—support versatile employment against area or point targets, though precision enhancements remain limited without extended-range modifications.^[1] No significant production controversies have emerged, though supply chain demands during sustained operations have prompted cost-reduction initiatives, such as substituting alternative steel alloys while maintaining performance thresholds.^[3]

Development and History

Origins and Adoption

The M795 155mm high-explosive projectile was developed by the U.S. Army as a successor to the longstanding M107 round, which suffered from comparatively limited fragmentation patterns and maximum effective range in late 20th-century evaluations.^[4]^[1] The M107's forged steel body produced fewer lethal fragments upon detonation, constraining its utility for area suppression in conventional engagements, while the M795's design incorporated a high-fragmentation steel (HF1) body to generate denser shrapnel dispersion.^[2] This shift was driven by empirical ballistic data highlighting the need for enhanced terminal effects against personnel and light materiel, with the M795 achieving roughly 100% greater lethality against exposed troops relative to the M107 in standardized tests.^[2] Key engineering motivations stemmed from first-principles analysis of projectile aerodynamics and explosive yield efficiency, including a welded rotating band that improved rifling engagement over the M107's swaged band, enabling higher muzzle velocities and extended ranges up to 30 kilometers from standard 155mm howitzers.^[4] Comparative trials in the 1990s validated these upgrades, demonstrating superior fragmentation density and blast radius without relying on exotic fillers, thus maintaining logistical compatibility with existing TNT-based burster charges.^[1] Qualification processes confirmed the round's reliability for sustained indirect fire support, prioritizing causal factors like fragment velocity and coverage area over prior designs' inconsistencies.^[4] Formal adoption followed successful qualification, with initial production contracts awarded on January 21, 1999, to facilities like the Scranton Army Ammunition Plant for metal parts fabrication.^[4] The U.S. Army designated the M795 as the standard high-explosive projectile for division- and corps-level artillery, with early fielding to 155mm howitzer batteries in both Army and Marine Corps units to bolster conventional warfare capabilities.^[1]^[5] This transition emphasized verifiable performance metrics from range trials, ensuring the M795's integration into operational stocks without disrupting supply chains reliant on conventional munitions.^[1]

Production Developments

The primary manufacturer of the M795 projectile is General Dynamics Ordnance and Tactical Systems, which operates the government-owned Scranton Army Ammunition Plant in Pennsylvania under a contractor-operated model. ^[6] This facility handles forging, machining, and assembly of the 155mm high-explosive projectile bodies, producing metal parts for large-caliber munitions. Early production of the M795 relied on TNT as the explosive fill, but efforts to enhance safety led to the adoption of insensitive munitions formulations. In 2010, the U.S. Army approved IMX-101, a polymer-bonded explosive developed by BAE Systems, as a TNT replacement due to its superior performance in insensitive munitions testing against threats like bullets and fragments.^[7] ^[8] Qualification testing demonstrated that IMX-101-equipped M795 variants exhibited far lower sensitivity, improving handling and storage safety without compromising lethality, with integration into production lines by around 2013.^[9] ^[10] Post-2022, production scaled significantly in response to heightened demand from U.S. military stockpiling and aid to Ukraine amid Russia's invasion. The Scranton plant increased output of M795 projectiles by 50% as of August 2024 through facility modernizations, including automated lines and workforce expansions, contributing to a near-quadrupling of overall U.S. 155mm M795 monthly production since early 2022.^[11] ^[12] Total U.S. 155mm artillery shell production, dominated by the M795 type, rose from approximately 14,000 rounds per month in early 2022 to over 40,000 per month by mid-2025, though goals of 100,000 rounds monthly were deferred to 2026 due to supply chain constraints in raw materials and components.^[13] ^[14] These adaptations highlighted vulnerabilities in peacetime industrial basing, prompting investments in domestic forging and explosive sourcing to mitigate reliance on foreign suppliers.^[6]

Design and Components

Projectile Body and Construction

The M795 projectile body is forged from high-fragmentation steel (HF1) alloy per MIL-S-50783 specifications, selected for its ability to shatter into numerous lethal fragments upon impact while withstanding the extreme stresses of artillery launch, including accelerations exceeding 15,000 g. This steel composition enhances shrapnel dispersion compared to milder alloys in predecessor designs, prioritizing fragmentation efficiency over ductility. The body forms a streamlined ogive nose and cylindrical midsection, approximately 33.2 inches in overall length, contributing to aerodynamic stability without reliance on fins or external aids.^[3]^[1]^[15] Near the base, the HF1 body is fitted with a welded gilding metal rotating band, typically a copper alloy, which expands to engage the rifling grooves of 155mm howitzer barrels, imparting rotational spin rates of around 20,000 rpm for gyroscopic stabilization in flight. This welded construction, unlike the swaged bands of earlier M107 projectiles, reduces manufacturing variability and improves obturation to minimize gas leakage, ensuring consistent bore engagement across M777, M109, and similar platforms. The band's placement close to the base optimizes balance and minimizes wobble.^[2]^[1]^[16] A carbon steel base-plate caps the rear to shield against erosion from propellant gases and maintain structural integrity, while the empty body weighs roughly 75 pounds before filling, yielding a total projectile mass of 103 pounds. For transport, a threaded lifting plug secures the nose, and a flexible grommet covers the rotating band to prevent corrosion and damage. These elements collectively ensure the body's durability under repeated handling and extreme environmental conditions, from -65°F to 160°F storage.^[17]^[18]^[1]

Explosive Fill and Fuzing

The M795 projectile contains 23.8 pounds (10.8 kg) of TNT as its standard explosive filler, providing a high blast and fragmentation effect upon detonation.^[2]^[1] This composition yields a detonation velocity and pressure profile suited to the high-fragmentation steel body, with empirical range testing confirming effective lethal radii against personnel and light materiel.^[19] An alternative filling uses IMX-101, a polymer-bonded explosive developed by BAE Systems and qualified by the U.S. Army in 2010 as a drop-in replacement for TNT.^[8] IMX-101 incorporates 50% RDX, 25% nitroguanidine, 20% aluminum, and 5% binder by weight, delivering equivalent or superior blast energy—approximately 1.25 times TNT's heat of explosion—while demonstrating far lower sensitivity in slow- and fast-cookoff, fragment impact, and sympathetic reaction tests per MIL-STD-2105 standards.^[9]^[20] This insensitivity reduces risks of unplanned initiation during logistics, as evidenced by qualification trials where IMX-101-filled rounds withstood bullet and shrapnel threats that initiated TNT equivalents.^[21] The projectile's standard fuze cavity conforms to STANAG 2916, ensuring compatibility with point-detonating fuzes for superquick surface impact, mechanical time fuzes for delay or height-of-burst control, and proximity (VT) fuzes for airburst effects optimized against exposed infantry.^[1]^[22] Fuze selection trades detonation timing for effect: point-detonating maximizes ground-level overpressure and fragmentation density, while proximity enables 2- to 10-meter bursts to enhance pattern coverage, as derived from live-fire lethality assessments showing 20-30% improved casualty radii versus impact-only modes.^[19] Filler density—targeted at 1.68-1.70 g/cm³ for IMX-101 versus TNT's 1.65 g/cm³—balances volumetric loading efficiency with sustained deflagration rates, supporting consistent fragment velocities of 1,200-1,500 m/s in hydrodynamic simulations and arena tests calibrated to match or exceed legacy M107 performance.^[9] This engineering prioritizes reliable energy transfer to the casing without compromising insensitive properties, mitigating trade-offs like minor velocity reductions from IMX-101's lower brisance.^[23]

Specifications and Performance

Physical Characteristics

The M795 projectile is a **155 mm** caliber high-explosive round designed for compatibility with standard NATO 155 mm artillery systems, ensuring interoperability among allied forces.^[1]^[2] Its body is forged from high-fragmentation steel (HF1 alloy), providing enhanced fragmentation upon detonation while maintaining structural integrity under extreme launch conditions.^[1]^[24] The projectile measures approximately 33.2 inches in total length and has an unfuzed weight of 103.4 pounds, with the steel casing comprising the majority of the mass to accommodate the explosive fill and withstand internal pressures and accelerations during firing.^[15]^[2] This configuration adheres to U.S. military specifications that align with broader NATO standardization efforts for 155 mm munitions, facilitating shared logistics and platform compatibility.^[25]

Ballistic and Lethal Effects

The M795 projectile, when fired from a 39-caliber 155 mm howitzer using standard propelling charges such as the M203A1, attains a muzzle velocity of approximately 830 m/s and a maximum range of 22.5 km at optimal elevation. Range varies with propelling charge increments and barrel length; for instance, employment of higher-zone charges or 52-caliber systems like the M109A7 can extend effective range to 30 km by increasing initial velocity and reducing drag losses over trajectory.^[26] Ballistic performance is governed by the projectile's aerodynamic profile, including its high fragmentation steel (HF1) body and gilded metal rotating band, which provide rotational stability factors sufficient for consistent flight paths, with drag coefficients optimized for minimal yaw and dispersion in standard atmospheric conditions.^[27] Terminal ballistics of the M795 emphasize enhanced fragmentation and blast upon impact or airburst, yielding a lethal radius of 30-60 meters against personnel, primarily from over 1,000 pre-formed fragments dispersed at velocities exceeding 1,000 m/s.^[28] This outperforms the legacy M107 projectile, which exhibits a 20-30 meter lethal radius, due to the M795's improved explosive fill (typically 10.8 kg TNT or IMX-101) and body design, resulting in up to 100% greater lethality against soft targets per manufacturer qualification data validated in U.S. Army testing.^[2] Empirical firing tables indicate dispersion patterns with a circular error probable (CEP) of approximately 139 meters at maximum range from a 39-caliber tube under standard fire control, attributable to stable gyroscopic motion and low overturning moments during launch and flight.^[29] Fuze options, such as point-detonating or proximity settings, further modulate blast radius and fragment density, with causal mechanics favoring dense target coverage through radial expansion of the 23.8-pound explosive charge.^[27]

Variants

M795E1 Improvements

The M795E1 variant incorporates structural modifications to the projectile body, including an elongated ogive with increased radius and an extended boat tail, enabling integration of a base bleed unit derived from the M864 projectile.^[30] These alterations, initiated in development during 2003, facilitate greater aerodynamic efficiency and reduced base drag, extending the effective range to approximately 29.3 km from the baseline M795's 22 km when fired from a 39-caliber howitzer.^[30] Parallel insensitive munitions upgrades, tested in the early 2010s, introduced IMX-101 explosive fill as a replacement for Composition B in M795-series projectiles, enhancing resistance to unintended detonation from cook-off, fragment impact, or sympathetic detonation.^[10] This formulation maintains comparable blast and fragmentation performance while meeting Department of Defense safety standards for reduced vulnerability in logistics environments, with empirical tests demonstrating delayed response times to thermal threats exceeding those of traditional fills by factors of 2-5 times in slow cook-off scenarios.^[31] The reinforced casing adaptations in the E1 configuration, including optimized body geometry, contribute to improved structural integrity under launch stresses and minor gains in fragment velocity dispersion, though quantitative data on velocity enhancements remain classified or limited to developmental trials showing marginal increases over baseline due to fill consistency.^[29] Fielding of E1 features has been constrained, primarily influencing subsequent variants like the XM1128, with production integrations for domestic and export stocks accelerating after 2015 via contracts emphasizing IM-compliant enhancements.^[32]

Precision Enhancements

Course Correcting Fuze Compatibility

The M795 projectile is compatible with retrofittable course-correcting fuzes designed to enhance precision through GPS/INS-guided trajectory adjustments, replacing the standard fuze without modifying the projectile body. These systems, such as the M1156 Precision Guidance Kit (PGK), integrate into existing M795 high-explosive rounds by screwing into the fuze well, deploying canards or fins mid-flight to correct ballistic errors from environmental factors like wind and firing inconsistencies.^[33]^[34] Early demonstrations, including United Defense's Course Correcting Fuze (CCF) tested in June 2005 at Yuma Proving Ground, involved inert M795 firings from an M109A6 Paladin howitzer to ranges of 14.5 kilometers, achieving preliminary accuracy improvements that tripled conventional performance by reducing dispersion.^[35]^[1] This compatibility provides a cost-effective upgrade path for legacy unguided munitions, avoiding the expense of fully guided projectiles like Excalibur while delivering circular error probable (CEP) thresholds below 50 meters—often as low as 30-32 meters in user acceptance tests conducted in October 2012.^[34]^[36] The PGK's guidance system processes GPS signals to compute corrections, validating efficacy through live-fire and inert trials that confirmed compatibility with M795's ballistic profile across standard artillery platforms. Later variants, including BAE Systems' Long-Range PGK (LR-PGK) qualified for M795 integration by 2022, extend this capability to longer ranges while maintaining the retrofit approach.^[37] Operational limitations include vulnerability to GPS jamming in contested environments, which can degrade accuracy without onboard countermeasures; however, post-2020 enhancements in LR-PGK incorporate anti-jam GPS receivers and inertial navigation backups to mitigate signal denial, as demonstrated in recent precision-fire capability tests.^[38]^[39] These upgrades ensure sustained performance under electronic warfare threats, though empirical data from jamming simulations underscore the need for redundant guidance in high-threat scenarios.^[40]

Operational Use

Military Platforms and Service History

The M795 projectile serves as the standard 155 mm high-explosive round for U.S. Army and Marine Corps artillery units, compatible with towed systems such as the M777 howitzer and self-propelled platforms including the M109 series.^[41] It was fielded in the late 1990s following initial production contracts awarded in 1998, establishing it as the primary munition for conventional high-volume fire missions.^[1] Logistically, the M795 integrates into U.S. fire support structures by prioritizing sustained rates of fire from compatible howitzers to deliver area suppression effects through blast and fragmentation, aligning with doctrinal emphasis on massed indirect fires for counter-battery and maneuver support rather than single-point precision strikes.^[42] Exports of the M795 have been authorized under Foreign Military Sales to allied nations, including Israel, where it supplements domestic 155 mm inventories for standard howitzer operations.^[43]

Deployments in Conflicts

The M795 projectile was employed by U.S. forces during Operation Iraqi Freedom starting in March 2003, fired from platforms like the M109 self-propelled howitzer to provide suppressive fire in support of mechanized infantry advances and urban clearing operations in cities such as Baghdad.^[44] Its use continued through the insurgency phase until 2011, though overall 155 mm artillery employment remained limited compared to prior conventional conflicts, with annual expenditures averaging tens of thousands of rounds rather than massed barrages.^[45] In Afghanistan, from 2001 onward, M795 rounds supported operations against Taliban positions, including integration with precision-guided fuzes for enhanced accuracy in rugged terrain, as seen in deployments ahead of the 2013 fighting season.^[46] The most extensive combat deployment of the M795 occurred in the Russo-Ukrainian War beginning in 2022, as the United States supplied Ukraine with over one million rounds of this standard high-explosive ammunition to replenish stocks depleted by intense artillery exchanges.^[47] By March 2025, total U.S. transfers of 155 mm shells exceeded three million, with the M795 comprising the bulk of high-explosive variants used by Western-supplied howitzers like the M777 to counter Russian artillery fire superiority along static front lines.^[48]^[45] These shipments ramped up significantly from late 2022, enabling sustained fire missions in trench networks and contested urban zones such as Bakhmut and Avdiivka, where volumes reached peaks of 5,000–10,000 rounds daily across Ukrainian batteries during critical phases.^[45]

Effectiveness and Analysis

Tactical Advantages and Empirical Outcomes

The M795 projectile provides tactical advantages through its design for extended range and enhanced lethality relative to the M107, enabling more effective conventional fire support at distances up to 30 kilometers with appropriate charges.^[1] Its high-fragmentation steel (HF1) body, filled with 10.8 kilograms of TNT, generates superior blast and shrapnel effects, optimizing casualty production against personnel in open terrain compared to the M107's less efficient casing.^[22] This fragmentation-focused construction increases fragment density and velocity, as confirmed in comparative analyses of 155mm projectiles, supporting area suppression and anti-infantry roles. In high-volume fire scenarios, the M795's low unit production cost of approximately $333 facilitates cost-effective attrition strategies, particularly in peer-level conflicts requiring sustained barrages, as evidenced by U.S. production surges to meet demands in Ukraine aid packages exceeding millions of rounds.^[49] Modeling from operational test evaluations demonstrates that mixes incorporating substantial proportions of M795 projectiles (>60%) achieve higher kill rates against combined infantry and armored threats, underscoring its efficiency in balancing precision and volume fire.^[50] These attributes affirm the M795's value in enabling rapid operational tempos without excessive expenditure. Sustained barrages with the M795 have demonstrated deterrence effects by disrupting enemy concentrations and maneuver, as integrated into field artillery tactics during 2000s counterinsurgency operations where high-explosive volume fire maintained suppressive dominance.^[51] After-action modeling and trade-off analyses highlight its role in elevating overall artillery effectiveness, with empirical simulations showing improved injury and kill metrics over legacy rounds in dynamic battle environments.^[50]

Criticisms, Reliability, and Limitations

The M795 projectile maintains a high reliability profile, with dud rates generally below 1% in controlled testing and modern fuze integrations, though operational audits in high-volume firing scenarios have occasionally documented rates approaching 2-3%, attributable to factors like impact angle and soil conditions.^[52] ^[53] These failures result in unexploded ordnance that persists as a hazard in extended conflicts, exacerbating clearance challenges despite self-destruct features in compatible electronic time fuzes reducing overall UXO risks compared to legacy designs.^[54] Supply chain vulnerabilities were highlighted by U.S. commitments to Ukraine aid between 2022 and 2024, where domestic 155mm production—primarily M795 variants—stood at roughly 14,000 rounds per month prior to the invasion, forcing diversions from national stockpiles and exposing single-source dependencies in propellant and forgings. Congressional reviews criticized this industrial base shortfall for undermining readiness, with ramp-up goals to 100,000 monthly rounds in 2025 falling short due to persistent bottlenecks, though output tripled from 2022 baselines through facility expansions.^[14] ^[13] Its standard range of 22.5 km with 39-caliber barrels limits effectiveness against counter-battery threats in peer conflicts featuring drones and extended-range adversary systems, compelling "shoot-and-scoot" maneuvers to evade detection and retaliation. ^[55] Analysts note that while extended-range alternatives like base-bleed variants address this gap, the M795's unguided nature prioritizes volume-of-fire doctrines over precision, with empirical data affirming sustained lethality through mass employment despite range constraints.^[56]

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Apr 22, 2024 · IMX-101 is the main explosive fill used in new 155mm M795 ... insensitive explosives, including IMX-101. It is also unclear how ...
[54]
Ukraine Update: How cluster munitions will address ... - Daily Kos
Jul 8, 2023 · These 155 mm DPICM shells collectively are said to have a failure rate of around 2.5% to 3%, and are likely the munitions the Biden ...<|separator|>
[55]
[PDF] PEO Ammunition
155mm M795 High Explosive Projectile ... specifications to support the ANA Fleet. CAPABILITY/CHARACTERISTICS: • 360 degree on-carriage traverse with 3 leg ...
[56]
Shoot and Scoot - Armada International
Aug 28, 2017 · The longer the engagement time the greater the possibility that the firing unit will be detected and receive incoming counter-battery fires.
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https://www.nationaldefensemagazine.org/articles/2022/7/11/new-artillery-rounds-to-help-army-reach-longer-distances/