Specialised Ammunition: JHP, AP, Frangible, Tracer and Less-Lethal

A jacketed hollow-point is a centrefire pistol or rifle projectile in which the jacket (typically gilding metal, 90Cu/10Zn) covers the sides and base of the bullet but terminates at the nose in a hollow cavity. On impact with tissue, the cavity fills with fluid and the hydraulic pressure wedges the jacket petals outward, increasing the bullet's frontal diameter from the nominal bullet diameter to typically 1.5 to 2.0 times that diameter. This expansion maximises energy transfer within the target while reducing overpenetration risk and the probability of secondary injury to bystanders, which is the principal consideration in law-enforcement ammunition selection. The Hague Declaration of 1899 prohibits expanding projectiles between combatants in international armed conflict; JHP is therefore a civilian law-enforcement and civilian self-defence design, not a standard military service round. Terminal performance across all these designs is verified in standardised ballistic gelatin testing.

FBI protocol and test media. The Federal Bureau of Investigation's Ballistic Testing Protocol, developed after the 1986 Miami FBI Shootout (in which agents armed with .38 Special FMJ rounds confronted suspects who continued fighting after multiple hits), specifies performance testing in 10 percent ordnance gelatin calibrated to FBI standard, with and without intervening barriers (heavy clothing, automobile glass, drywall, plywood, sheet metal). The protocol requires 12 to 18 inches of penetration depth in bare gelatin and a minimum expansion to 1.5 times the original diameter. A round that fails to expand (due to clogged cavity from heavy clothing) but penetrates 12 to 18 inches still passes; a round that expands but penetrates only 8 inches fails because it may not reach the vital organs through an intermediate barrier. This trade-off between expansion and penetration depth defines the performance requirements for law-enforcement JHP development.

Federal HST. Federal Premium's HST uses a mechanically formed, open-cavity design with no polymer tip; it is a distinct product from the older Hydra-Shok line despite the similar name. The HST 124 gr 9x19mm (+P) produces consistent expansion to approximately 0.60 to 0.65 inches (15.2 to 16.5 mm) in bare gelatin and retains over 98 percent of its original 124 gr weight after expansion. The Federal HST is standard issue for the US Secret Service, the US Marshals Service, and numerous large municipal police departments. In the UK, the Met Police counter-terrorism unit (SO19 / CO19) has evaluated HST and comparable designs; UK Home Office circular approval is required before a police force may deploy hollowpoint ammunition, a process codified under the Firearms Act 1968 and Home Office guidance.

Winchester Ranger T-Series. The Ranger T (Talon, Black Talon's successor) uses a reverse-taper jacket that uncoils on expansion into six sharp-edged petals. The 147 gr 9x19mm Ranger T subsonic load has been standard police-issue for several US metropolitan departments; LAPD adopted it before moving to Speer Gold Dot G2 147 gr, and NYPD uses Speer Gold Dot 124 gr +P. The 147 gr weight at subsonic velocity (approximately 990 fps) produces lower felt recoil and suppressor-compatible terminal performance for tactical units. On autopsy, the sharp hexagonal petal pattern of an expanded Ranger T is visually distinctive and identifiable without instrumentation.

Speer Gold Dot Bonded. Speer Gold Dot uses electrochemical bonding of the jacket to the core, preventing the jacket-core separation seen in non-bonded designs at high impact velocity or after intermediate-target penetration. The Gold Dot 124 gr +P 9mm is the standard round for the US Federal Air Marshals program and several large US police departments. The bonded construction means recovered Gold Dot projectiles from autopsy or forensic scenes usually present as a single piece with petals intact, making product identification from the recovered bullet reliable.

Hornady Critical Duty 135 gr 9mm +P. Hornady Critical Duty uses a Flex Tip (polymer tip seated in the hollow cavity) that prevents cavity clogging through intermediate barriers at the cost of slightly reduced expansion diameter relative to open-cavity designs. The Flex Tip deflects upward on impact and initiates expansion. Critical Duty is optimised for the FBI protocol's barrier-after criteria and is used by law-enforcement agencies that may encounter automotive glass, heavy clothing, or vehicle-door sheet metal between the officer and the threat. The 135 gr +P load achieves approximately 1,300 fps from a 4-inch barrel.

Indian context. Indian Ordnance Factory does not commercially produce JHP pistol ammunition for domestic sale. The IOF supplies FMJ service rounds for police and military. NSG (National Security Guard) and RAW (Research and Analysis Wing) special operations units have been documented as using commercially imported JHP ammunition from Federal and Speer suppliers, but this is not publicly confirmed in official records. Any JHP recovered at an Indian crime scene is therefore either an imported commercial round, a military-imported special-operations issue, or in rare cases a modified round. The Arms Act 1959 and the Arms Rules 2016 do not explicitly prohibit JHP possession by licensed civilian owners, but import restrictions effectively limit civilian access.

Armour-piercing pistol ammunition presents a harder core, typically tungsten carbide, tool steel, or hardened steel, within or as the primary bullet component, designed to penetrate soft body armour (NIJ Level II and IIIA) that defeats standard FMJ pistol rounds. AP rifle ammunition extends this to defeat hard-plate body armour (NIJ Level III and IV) rated to stop standard rifle FMJ rounds.

M2 AP .30 calibre. The Second World War US Army armour-piercing standard for .30-06 Springfield. The M2 AP uses a black-tip-painted bullet with a hardened steel core inside the gilding-metal jacket, over a lead tip. Black tip painting is the NATO standard colour-coding for AP projectiles across most armies. M2 AP.30-06 cases are now essentially historical in casework but appear in legacy weapon examinations.

M61 AP 7.62x51mm NATO. The NATO standard AP designation for the 7.62x51mm machine-gun and rifle round. M61 uses a tungsten-carbide penetrator core inside a gilding-metal jacket. It is not commercially available for civilian sale in the US under the 1986 Law Enforcement Officers Protection Act (LEOPA), which prohibits the manufacture, import, and sale of AP pistol ammunition and, by ATF interpretation extension, certain AP rifle ammunition that could be fired from a handgun. M61 production is confined to military use.

M855 and M855A1 5.56x45mm. M855 (SS109, the NATO standard 5.56mm load, 62 gr) uses a steel tip over a lead core inside a gilding-metal jacket. The steel tip is not a true AP core; it is a penetrator insert designed to improve accuracy at longer range and provides incidental steel-target penetration at close range. ATF has declined to classify M855 as AP pistol ammunition for LEOPA purposes, based on its lead-core construction. The green tip painting on M855 is the identifier and is a well-known visual marker in the US civilian market.

M855A1 EPR (Enhanced Performance Round), the current US Army service 5.56mm round, uses a copper-alloy body with an exposed steel penetrator at the nose and no lead core at all. ATF has classified M855A1 as armour-piercing for purposes of the LEOPA definition when fired from a pistol-length barrel but has not imposed civilian sale restrictions as of 2024 because the round is military-only. The distinction matters in casework because M855A1 recovered from a scene carries an immediately visible copper body (not gilding-metal) with an exposed steel tip that distinguishes it from M193 and M855 on visual examination.

The Brady Act AP debate. The Brady Handgun Violence Prevention Act 1993, and its predecessor LEOPA 1986, banned cop-killer bullets, but the statutory definition of AP ammunition (a projectile or projectile core constructed entirely of one or a combination of tungsten alloys, steel, iron, brass, bronze, beryllium copper, or depleted uranium) created ambiguity around steel-tipped but lead-core bullets including M855. ATF's 2015 proposed framework to classify M855 as AP under the handgun-cartridge standard triggered significant political and industry opposition and was withdrawn. The legal boundary remains contested in 2024.

UK controls. Under the UK Firearms Act 1968 Section 5(1)(f), expanding ammunition for pistols is specifically prohibited for civilian possession (added by the 1988 amendment); armour-piercing ammunition for any category falls under the UK's general Prohibited Weapon definitions and requires a Ministry of Defence authority for possession. UK courts including the Crown Court at the Old Bailey have handled AP ammunition cases under these provisions.

India. The Indian Arms Act 1959 and Arms Rules 2016 do not use the term "armour-piercing" as a specific legal category; instead, they prohibit ammunition with characteristics that exceed the NON-Prohibited Bore (NPB) category. In practice, AP rifle ammunition including 7.62x39mm with steel-core bimetallic jacket construction (the standard Soviet and AK-pattern round) is classified as Prohibited Bore ammunition requiring a special licence, and its seizure in Naxalite operations triggers specific offence provisions under the Arms Act and the newer BNSS 2023 provisions.

Frangible ammunition is designed to disintegrate into fine fragments on contact with a hard surface, primarily for use in indoor shooting ranges and aircraft-security environments where a ricochet from a backstop or hull surface presents a hazard to the shooter or bystanders. Unlike a standard lead-core jacketed bullet, a frangible bullet leaves no intact recoverable projectile after impact with a steel or concrete backstop.

Composition. Frangible bullets are made from compressed metal powders, most commonly copper powder (the Sinterfire design uses 97 percent copper powder with a polymer binder), tin powder, or zinc powder. The Sinterfire 9x19mm 100 gr frangible bullet is a compressed copper-tin matrix formed into a bullet profile without a jacket. Federal BallistiClean uses a similar compressed-metal construction. When fired, frangible bullets travel normally through the air and through soft tissue up to the point of impact with a surface harder than the bullet matrix; at that point, the compressed structure fails in shear and the bullet powder-fragments. On skin or soft tissue, frangible bullets cause a wound pattern with multiple small-diameter fragment tracks dispersed around the entry axis, rather than a single penetrating channel.

Glaser Safety Slug. An older frangible/pre-fragmented design, the Glaser Safety Slug uses a conventional brass jacket and a compressed lead shot (birdshot pellets) core sealed with a polymer cap. On tissue impact, the brass peels back and the shot disperses within approximately 6 inches of penetration depth. Glasers are sold commercially in the US and UK. Because they disperse birdshot, wound tracks show multiple small spherical fragment traces on radiograph, which is distinctively different from both FMJ and JHP wound patterns.

Forensic signature. When a frangible round is used at a homicide scene, the examiner typically finds: (1) no intact recovered projectile at autopsy; (2) a wound channel with multiple radially dispersed metallic fragments on X-ray; (3) copper, tin, or zinc powder residue on the entry wound margin and garment; (4) a characteristic lack of exit wound or very limited exit wound because all projectile mass is deposited within the first few inches. The Sinterfire fragment dust from a missed shot against a steel backstop at a training range is often recoverable from garments and surfaces; its XRF elemental profile (copper-dominant with tin binder) distinguishes it from lead-core jacketed fragments.

Range restriction. In US law, frangible ammunition is not subject to any specific federal restriction beyond the general LEOPA AP framework (copper and tin alloy are not listed AP materials). In the UK, frangible ammunition for police training use must comply with Home Office ballistic testing requirements. Indian police range safety doctrine does not separately categorise frangible ammunition in CRPF or state police range manuals, though its use at CRPF indoor training facilities has been noted in procurement documents.

Tracer ammunition incorporates a pyrotechnic composition in a cavity at the base of the bullet. The composition ignites from the heat of propellant gases during firing and burns during flight, emitting a visible light track (typically red or orange, sometimes white or green for different military designations). Tracer ammunition is used in machine-gun belts at a ratio of one tracer to every four ball rounds (the 4:1 ball-to-tracer ratio in NATO doctrine) to allow the gunner to observe and correct the trajectory during a long burst.

M62 7.62x51mm NATO tracer. The standard NATO 7.62mm tracer projectile, identifiable by its red-painted tip (the NATO colour code for tracer is red; AP is black, API is silver or black+red). M62 is loaded in belts for the M60 and M240 machine guns and the FN MAG in British, Indian, and most NATO-aligned service. The M62 bullet weighs 142 gr (lighter than the standard 147 gr M80 ball) and has a strontium-nitrate-and-magnesium tracer composition (strontium nitrate, magnesium powder, polyvinyl chloride, and calcium resinate) in the base cavity extending approximately 0.3 inches into the bullet body.

M196 5.56x45mm tracer. The 5.56mm tracer for M16/M4 and INSAS use, with a red-tip marking and a dimethyl-fumarate or magnesium-based tracer compound. India's INSAS 5.56mm belt-fed version (the INSAS LMG) uses equivalent tracer rounds.

Identification in casework. An intact M62 or M196 tracer bullet is immediately identifiable by the red-painted tip (for ATF and CIP colour-coding purposes) and the hollow tracer cavity at the base. A fired tracer projectile recovered from a scene shows a burnt-out or partially burnt tracer cavity residue (the grey-white or yellowish pyrotechnic ash) in the base cavity, and the cavity geometry itself is diagnostic. The base cavity in a tracer round is circular and centrally placed with a uniform depth; this is different from a hollow-base swaged target bullet (where the cavity is concave and production-formed) and from a cavity left by post-fire deformation.

Scene implications. Tracer rounds are military-issue in most jurisdictions, not commercially available for civilian purchase in the US (restricted under LEOPA for the same reason as AP) or in the UK (Section 5 prohibited weapon), or in India (Prohibited Bore). The recovery of a tracer bullet or case at a crime scene therefore immediately implies military supply-chain access or armed-forces connection, which has significant investigative value in interpreting the weapon source. The Operation Black Tornado scene recoveries in Mumbai 2008 included tracer cases confirming the attackers had access to military-grade belt-fed ammunition.

Less-lethal projectiles are designed to incapacitate by pain compliance, blunt impact, or chemical irritant delivery without penetrating skin and vital organs at the intended operational range. They are used by police and paramilitary forces for crowd control, hostage situations, and arrest-of-suspects scenarios where lethal-force is not authorised or where a graduated response is required. The forensic significance of a less-lethal projectile at a scene is different from a conventional bullet: the examiner is not investigating a homicide (though they may be if the less-lethal projectile caused a fatal injury) but is documenting what type of force was used, at what range, by what agency, and whether the use conforms to the operational doctrine for that device.

Rubber baton rounds (UK / PSNI). The UK and Northern Ireland Police Service have used a sequence of baton round designs since the early 1970s. The L5A7 rubber baton round (used in the 1970s-90s Troubles era in Northern Ireland) was a 37mm rubber cylinder that was directly lethal at close range and caused multiple fatalities. It was replaced by the L21A1 Attenuating Energy Projectile (AEP), a 37mm polyurethane-bodied round designed to be fired at the lower body at 20-40 metres. The L21A1 has been used by PSNI (Police Service of Northern Ireland) and by forces in England during major disorder events. Each round carries a manufacturer code and a lot number visible on the projectile body. The UK Home Office Scientific Development Branch maintains performance data for each deployed design. Recovery of an L21A1 body at a scene identifies the specific device, the lot, and therefore the deployment authority.

Rubber bullets (India, CRPF). Indian Central Reserve Police Force (CRPF) and Jammu and Kashmir Police use Indian-produced rubber bullets manufactured to specifications similar to the L5A7 design as crowd-control munitions. Indian rubber bullets are cylindrical or spherical moulded rubber, fired from dedicated riot-control launcher barrels or from adapter-modified service rifles. They are not individually serialised in the way that UK L21A1 rounds are, but they carry manufacturer markings and a date code that can establish production batch and supply contract. In Naxalite-affected areas, the distinction between rubber-bullet injuries and conventional-bullet injuries is medically and forensically significant because it affects the legal determination of excessive force.

Beanbag rounds (US, UK). The 12-gauge beanbag round is a cloth pouch filled with lead shot (or, in modern designs, a hard polyethylene block) fired from a standard 12-gauge shotgun at muzzle velocities of approximately 280 fps (Federal Laboratory Model 506, 600-grain Drag Stabilised Beanbag). The typical effective operational range is 3 to 15 metres; closer than 3 metres the round can penetrate; further than 15 metres the impact force drops below effective pain-compliance threshold. Beanbag rounds are standard equipment for US law-enforcement agencies including LAPD, and their forensic examination in use-of-force investigations involves measuring the impact point, the angle of fire, and any laceration pattern from the stitching of the pouch at close range.

Sponge grenades (MK19 sting-ball grenades, US). The MK19 sting-ball grenade is a less-lethal hand-delivered device that distributes a cloud of rubber pellets in a burst pattern. Its forensic examination focuses on pellet distribution pattern (which establishes burst position, approximate distance, and deployment geometry), individual pellet collection (the rubber pellets are distinctive in composition and density compared to conventional lead shot), and chemical residue from the propelling charge.

Fatality analysis. In the Adam Scott context referenced in calibre systems and headstamp identification, and more directly in the 2011 death of Jose Guerena (a Tucson, Arizona SWAT raid in which he was shot with conventional firearms, not a less-lethal device) and the 2008 death of Victoria Snelgrove (Boston, 2004, who died from a pepper-spray projectile aimed at crowd control), the forensic examiner's role in less-lethal fatalities requires the same disciplined analytical sequence as conventional shooting cases: projectile identification, range estimation from impact pattern, angle of delivery, and medical cause-of-death correlation.

When a projectile or projectile fragment is submitted to the firearms laboratory from a scene or autopsy, the initial examination should establish the category before attempting source attribution within that category. The category question matters because it determines what analytical tools are applied, what legal framework governs the submission, and what the evidentiary narrative should address.

Step 1: Is the object metallic, rubber, or composite? A rubber baton round or beanbag pouch is identifiable on sight. A copper-matrix frangible fragment may require XRF to distinguish from jacketed lead. A tracer base-cavity ash may require SEM-EDS to distinguish from deformed FMJ base geometry. Rapid visual and magnet-test triage: steel-core AP rounds are magnetic; standard gilding-metal-jacketed lead-core rounds are not; frangible copper-matrix rounds are not (unless containing iron powder, which some designs do).

Step 2: For metallic projectiles, measure calibre. The groove-impression diameter (the larger measurement from the rifling marks on the recovered bullet, corresponding to the barrel's groove diameter) allows calibre assignment before and independent of headstamp examination on associated cases.

Step 3: Check for hollow cavity, tracer cavity, or hard core. Visual examination under 10x magnification identifies: JHP petals and hollow cavity; tracer base cavity and residual pyrotechnic compound; AP penetrator tip geometry. Sectioning (longitudinal and transverse) under the comparison microscope allows core material identification: lead (soft, silvery), steel (hard, dark), tungsten carbide (grey-white, extremely hard, produces spark on grinding wheel).

Step 4: Product identification. Expanded JHP can often be product-identified from petal count (Federal HST has 8 petals; Winchester Ranger T has 6; Speer Gold Dot has 4-6 depending on calibre), petal geometry, and retained weight. Tracer rounds can be lot-identified from base geometry and pyrotechnic compound analysis. AP rounds are identified by core material and by tip geometry cross-referenced against military ballistic manuals (US Army TM 43-0001-27 Ammunition and Explosives Standards, the UK's JSP 403 Vol 1 Explosives Regulations).

UK NABIS integration. In the UK, any recovered specialised round (AP, tracer, or expanded JHP from a shooting) is entered into the NABIS ballistic intelligence system, which cross-references recovered specialised rounds across UK forces. The NABIS database flagged a pattern of AP-capable pistol rounds in several 2019-2022 Greater Manchester armed robberies, which contributed to the tracing of a specific European supply chain by National Crime Agency investigation teams.

Indian CFSL integration. Indian CFSL laboratories at Chandigarh and Hyderabad maintain reference collections for military-issue AP and tracer round identification. JHP submissions are treated as export-import evidence and are cross-referenced with Directorate General of Foreign Trade import records to establish the chain of possession from commercial import to scene recovery.