Green bullet

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M855A1 projectiles for 5.56x45mm NATO rifles replace traditional lead alloy cores with an environmentally friendly copper core with a 19-grain (1.2 g) steel "stacked-cone" penetrating tip. 5.56 M855A1 Enhanced Performance Round.jpg
M855A1 projectiles for 5.56×45mm NATO rifles replace traditional lead alloy cores with an environmentally friendly copper core with a 19-grain (1.2 g) steel "stacked-cone" penetrating tip.
Solid copper bullets typical of the majority of nonlead ammunition certified for hunting in California. The .25 caliber (6.4 mm) bullet on the left has a small cylindrical cavity in the nose, and the .35 caliber (9 mm) bullet on the right has a larger cavity holding an aerodynamic plastic tip. CopperBullets.png
Solid copper bullets typical of the majority of nonlead ammunition certified for hunting in California. The .25 caliber (6.4 mm) bullet on the left has a small cylindrical cavity in the nose, and the .35 caliber (9 mm) bullet on the right has a larger cavity holding an aerodynamic plastic tip.

Green bullet, green ammunition or green ammo are nicknames for a United States Department of Defense program to eliminate the use of hazardous materials from small arms ammunition and from small arms ammunition manufacturing. Initial objectives were elimination of ozone-depleting substances, volatile organic compounds, and heavy metals from primers and projectiles. These materials were perceived as causing difficulties through the entire life cycle of ammunition. The materials generated hazardous wastes and emissions at manufacturing facilities and use of ammunition caused contamination at shooting ranges. Potential health hazards made demilitarization and disposal of unused ammunition difficult and expensive. [2]

Contents

The Joint Working Group for Non-Toxic Ammunition was formed by the Small Caliber Ammunition Branch of the United States Army Armament Research, Development and Engineering Center in October 1995. Members of the working group included the National Guard of the United States, the United States Coast Guard, the United States Army Infantry School, the Industrial Operations Command, the Lake City Army Ammunition Plant, the Oak Ridge National Laboratory, the Los Alamos National Laboratory and the United States Department of Energy Kansas City Plant. [2]

Background

In 2013, lead bullet production represented the second largest use of lead in the U.S., after lead-acid batteries. [3] Studies by the U.S. CDC suggest blood lead levels are correlated with self-reported consumption of game meat. [4]

Legislation

October 11, 2013 Governor Jerry Brown of California signed into law AB 711 Hunting: nonlead ammunition. [5] Cost reductions from conversion to green ammo are estimated at "$2.5 million required for waste removal at each outdoor firing range as well as the $100 thousand annual costs for lead contamination monitoring". [6]

Identified hazardous materials

Hazardous materialLocation [2] New material
antimony projectile tungsten-tin or -nylon [7]
antimony trisulfide primer diazodinitrophenol (DDNP) [8]
barium nitrate tracer or incendiary projectile
barium peroxide primer and tracer or incendiary projectilediazodinitrophenol
ethyl acetate blank cartridge tip sealantSolventless process [9]
ethyl alcohol tracer or incendiary projectile
glycol ether painted projectile point
lead projectilesteel [10] tungsten-tin or tungsten-nylon [11] [12] [13] copper [14]
lead dioxide tracer or incendiary projectile
lead styphnate primerdiazodinitrophenol, MIC, e.g. Al/MoO3
methyl chloroform casemouth sealant and tracer or incendiary projectile
methyl ethyl ketone primer and sealants for primer pocket and blank cartridge tipSolventless process
methyl isopropyl ketone primer and sealants for primer pocket and blank cartridge tipSolventless process
toluene primer and sealants for primer pocket and blank cartridge tipSolventless process
xylene sealants for primer pocket and blank cartridge tip

Green ammunition

Jim Newill explains the effectiveness of the Army's 5.56mm M855A1 Enhanced Performance Round (2011) US Army green bullet test.jpg
Jim Newill explains the effectiveness of the Army's 5.56mm M855A1 Enhanced Performance Round (2011)

Two green ammunition cartridges are the 5.56×45mm NATO M855A1 and the MK281 40 mm grenade. Switching to the 5.56 mm green bullet, the M855A1 Enhanced Performance Round, or EPR, in 2010 has eliminated nearly 2,000 tons of lead from the waste stream. [15] U.S. Army representatives at a 2013 House Armed Services Committee hearing have credited the 5.56mm M855A1 Enhanced Performance Round "close to" those of a 7.62 mm in its performance capabilities. [16] The longer, less dense M855A1 bullet must be seated deeper than the lead core bullet it replaced to maintain the same exterior cartridge dimensions required for reliable functioning in self-loading firearms; and higher pressure is required to obtain the same bullet velocity with reduced propellant volume. Increased pressure causes gas port erosion producing a higher cyclic rate of automatic fire making jamming malfunctions more likely. Cracks in bolt locking lugs have been observed after 3000 rounds of full automatic fire with the M855A1 cartridge. [17]

Enhanced Performance Round, Lead-Free

The Army Research Laboratory and other participants developed the M855A1, Enhanced Performance Round (EPR), by applying ballistics concepts originally used in large-caliber cartridges to small arms. The result was significant improvements to lethality of small arms. [18] [19] The 5.56-mm (M855A1) ammunition was first battle-tested in mid-2010 in Afghanistan. The 7.62-mm (M80A1) ammunition was fielded in 2014. [18]

The EPR "bronze tip" ammo – previously known generically as "Green Ammo" – was born at the kickoff meeting for Phase II of the Army's Green Ammunition replacement program in mid-2005, at the Lake City Army Ammunition Plant. Participants met to discuss problems surrounding environmentally-friendly small arms training ammunition. [18]

The program team was composed of Project Manager, Maneuver Ammunition Systems (PM-MAS), Army Research Laboratory (ARL), U.S. Army Armaments Research Development and Engineering Center (ARDEC), and other team members. Participants evaluated more than 20 potential projectile designs before moving forward with a three-piece, reverse-jacket bullet design incorporating a hardened steel penetrator and lead-free slug. [20]

The EPR produces consistent effects against soft targets; increased effectiveness at long ranges; increased defeat of hard targets; and reduced muzzle flash (to help conceal soldiers' firing positions). The lead-free cartridges also reduce environmental impact by removing more than 2,000 metric tons of lead per year that otherwise could end up in the environment. [18] [19]

The EPR contains an environmentally-friendly projectile that eliminates lead from the manufacturing process in direct support of Army commitment to environmental stewardship. [21] Under the Green Ammo Phase II initiative, the Army focused on lead-free ammo in stateside training ranges, in response to tightening state environmental regulations. [18]

Wildfire considerations

Some of a bullet's kinetic energy is typically converted to heat if the bullet strikes a hard surface like rock. Collision debris may include high temperature bullet fragments as sparks. Steel core and solid copper ammunition have the highest potential to start wildfires. Lead core bullets are less likely to ignite surrounding vegetation. [22] [23]

Rifling considerations

Rifling is required to stabilize elongated bullets, and longer bullets require faster rotation for similar stability. The rate of rotation is determined by the twist of the lands and grooves engraved on the interior of a rifled barrel. Twist is usually expressed as the length of barrel (in inches) in which the bullet will rotate through a full 360 degrees; so bullets fired from a 1:10" twist rifle will make a complete rotation in every 10 inches (25 cm) of distance traveled. [24]

Since lead is a very dense material, bullets made of inexpensive, non-toxic materials will be lighter than bullets made of lead unless bullet length is increased. Inferior external ballistics cause lighter bullets to be less effective against distant targets. Increasing bullet length may require a faster rifling twist to maintain stability. Some early trials versions of the M16 rifle had 1:14" twist barrels, but this was increased to 1:12" twist in early military production to improve stability with 55-grain (3.6 g) M193 lead-core bullets in the early 5.56×45mm NATO cartridges. Twist was increased to 1:9" after combat experience demonstrated the advantages of longer 62-grain (4.0 g) M855 bullets with a portion of the lead core replaced by a less dense steel penetrator. Barrels with 1:7" twist have been used in 21st century 5.56×45mm NATO firearms and have replaced barrels of older United States military firearms to stabilize longer M856 tracer bullets and M855A1 green bullets of less dense materials. [25]

See also

Related Research Articles

<span class="mw-page-title-main">5.56×45mm NATO</span> Service rifle cartridge

The 5.56×45mm NATO is a rimless bottlenecked centerfire intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal. It consists of the SS109, L110, and SS111 cartridges. On 28 October 1980, under STANAG 4172, it was standardized as the second standard service rifle cartridge for NATO forces as well as many non-NATO countries. Though they are not identical, the 5.56×45mm NATO cartridge family was derived from and is dimensionally similar to the .223 Remington cartridge designed by Remington Arms in the early 1960s.

<span class="mw-page-title-main">Bullet</span> Projectile propelled by a firearm, sling, or air gun

A bullet is a kinetic projectile, a component of firearm ammunition that is shot from a gun barrel. They are made of a variety of materials, such as copper, lead, steel, polymer, rubber and even wax; and are made in various shapes and constructions, including specialized functions such as hunting, target shooting, training, and combat. Bullets are often tapered, making them more aerodynamic. Bullet size is expressed by weight and diameter in both imperial and metric measurement systems. Bullets do not normally contain explosives but strike or damage the intended target by transferring kinetic energy upon impact and penetration.

<span class="mw-page-title-main">Cartridge (firearms)</span> Pre-assembled firearm ammunition consisting of a casing, projectile, propellant, and primer

A cartridge, also known as a round, is a type of pre-assembled firearm ammunition packaging a projectile, a propellant substance and an ignition device (primer) within a metallic, paper, or plastic case that is precisely made to fit within the barrel chamber of a breechloading gun, for convenient transportation and handling during shooting. Although in popular usage the term "bullet" is often used to refer to a complete cartridge, the correct usage only refers to the projectile.

<span class="mw-page-title-main">.40 S&W</span> Pistol cartridge

The .40 S&W (10.2×22mm) is a rimless pistol cartridge developed jointly by American firearms manufacturers Smith & Wesson and Winchester in 1990. The .40 S&W was developed as a law enforcement cartridge designed to duplicate performance of the Federal Bureau of Investigation's (FBI) reduced-velocity 10mm Auto cartridge which could be retrofitted into medium-frame semi-automatic handguns. It uses 0.40-inch-diameter (10 mm) bullets ranging in weight from 105 to 200 grains.

<span class="mw-page-title-main">.380 ACP</span> Pistol cartridge designed by John Moses Browning

The .380 ACP, also known as .380 Auto, .380 Automatic, or 9×17mm, is a rimless, straight-walled pistol cartridge that was developed by firearms designer John Moses Browning. The cartridge headspaces on the mouth of the case. It was introduced in 1908 by Colt, for use in its new Colt Model 1903 Pocket Hammerless semi-automatic, and has been a popular self-defense cartridge ever since, seeing wide use in numerous handguns. Other names for .380 ACP include 9mm Browning, 9mm Corto, 9mm Kurz, 9mm Short, and 9mm Browning Court. It should not be confused with .38 ACP. The .380 ACP does not strictly conform to cartridge naming conventions, named after the diameter of the bullet, as the actual bullet diameter of the .380 ACP is .355 inches.

<span class="mw-page-title-main">9×19mm Parabellum</span> Pistol cartridge designed by Georg Luger

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<span class="mw-page-title-main">.22 long rifle</span> Common ammunition cartridge

The .22 long rifle, also known as the .22 LR or 5.7×15mmR, is a long-established variety of .22 caliber rimfire ammunition originating from the United States. It is used in a wide range of firearms including rifles, pistols, revolvers, and submachine guns.

<span class="mw-page-title-main">.223 Remington</span> Firearms cartridge

The .223 Remington is a rimless, bottlenecked, centerfire intermediate cartridge. It was developed in 1957 by Remington Arms and Fairchild Industries for the U.S. Continental Army Command of the United States Army as part of a project to create a small-caliber, high-velocity firearm. The .223 Remington is considered one of the most popular common-use cartridges and is used by a wide range of semi-automatic and manual-action rifles.

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<span class="mw-page-title-main">.22 long</span> Variety of rimfire 22 caliber ammunition

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<span class="mw-page-title-main">.243 Winchester</span> Rifle cartridge

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<span class="mw-page-title-main">6.8mm Remington SPC</span> Intermediate rifle cartridge

The 6.8mm Remington Special Purpose Cartridge is a rimless bottlenecked intermediate rifle cartridge that was developed by Remington Arms in collaboration with members of the U.S. Army Marksmanship Unit and United States Special Operations Command to possibly replace the 5.56 NATO cartridge in short barreled rifles (SBR) and carbines. Based on the .30 Remington cartridge, it is midway between the 5.56×45mm NATO and 7.62×51mm NATO in bore diameter. It uses the same diameter bullet as the .270 Winchester hunting cartridge.

<span class="mw-page-title-main">Armor-piercing bullet</span> Type of ammunition

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The 7.5×54mm French, 7.5 French, or 7.5 MAS is a rimless bottlenecked rifle cartridge. It was developed by France as an update to the 7.5×57mm MAS mod. 1924 cartridge. It replaced the obsolete 8×50mmR Lebel round used during World War I, and served as the French service cartridge until superseded by the 5.56×45mm NATO and 7.62×51mm NATO cartridges in the 1970s and 1980s.

<span class="mw-page-title-main">STANAG magazine</span> 5.56x45mm NATO firearm magazine standard

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The following are terms related to firearms and ammunition topics.

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<span class="mw-page-title-main">7.62×51mm NATO</span> Rimless, centerfire, bottlenecked rifle cartridge

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References

  1. ↑ "Certified Nonlead Ammunition". California Department of Fish and Wildlife. Retrieved 27 March 2017.
  2. 1 2 3 Bunting, Wade H. (September–October 1997). "Green Bullets". Hazardous Technical Information Services Bulletin. 7 (5): 4–5.
  3. ↑ "Lead Statistics and Information | U.S. Geological Survey" (PDF). Archived (PDF) from the original on 2016-03-10. Retrieved 2016-07-11.
  4. ↑ Iqbal, Shahed; Blumenthal, Wendy; Kennedy, Chinaro; Yip, Fuyuen Y.; Pickard, Stephen; Flanders, W. Dana; Loringer, Kelly; Kruger, Kirby; Caldwell, Kathleen L.; Jean Brown, Mary (2009). "Hunting with lead: Association between blood lead levels and wild game consumption". Environmental Research. 109 (8): 952–959. Bibcode:2009ER....109..952I. doi:10.1016/j.envres.2009.08.007. ISSN   0013-9351. PMID   19747676.
  5. ↑ "California signed into law AB 711 Hunting: nonlead ammunition". October 11, 2013.
  6. ↑ John Middleton (2000). "Elimination of Toxic and VOC Constituents from Small Caliber Ammunition (WP-1057)". Archived from the original on 2013-12-24. Retrieved 2013-12-23.
  7. ↑ Don Mikko (June 2000). "U.S. Military Green Bullet. A Technical Report".
  8. ↑ Michael Courtney and Amy Courtney (2012). "High-speed measurement of firearm primer blast waves". arXiv: 1203.2701 [physics.pop-ph].
  9. ↑ T. G. Manning; D. Thompson; M. Ellis; R. Lieb; M. Leadore; J. Colburn; B. E. Homan; D. A. Worrell; K. B. Moran; S. J. Ritchie. "Environmentally Friendly 'Green' Propellant for the Medium Caliber Training Rounds". Archived from the original on 2010-01-10. Retrieved 2013-12-23.
  10. ↑ Information Search of Toxic-Free Ammunition, DTIC A336762, 1994, http://www.dtic.mil/dtic/tr/fulltext/u2/a336762.pdf Archived 2017-02-26 at the Wayback Machine
  11. ↑ US 8202377,Erickson, Jack; Sandstrom, Joel& Johnston, Geneet al.,"Non-toxic percussion primers and methods of preparing the same",published 2012-06-19, assigned to Alliant Techsystems Inc.
  12. ↑ 1994 report: Tungsten ‘highly toxic', 2007, updated 2011 http://www.capecodtimes.com/article/20070222/NEWS01/302229999
  13. ↑ Army to scrap tungsten bullets, 2008 http://www.capecodtimes.com/article/20080911/NEWS/809110313
  14. ↑ National Guard goes green with copper bullets, 2012 http://www.capecodtimes.com/article/20120926/NEWS/209260326
  15. ↑ Audra Calloway (1 July 2013). "Picatinny ammo goes from regular to unleaded". Army.mil. Archived from the original on July 6, 2013. Retrieved 30 December 2014.
  16. ↑ Scott R. Gourley (May 7, 2013). "U.S. Army Touts M855A1 Round Performance 'Close to' a 7.62". Defense Media Network. Archived from the original on October 6, 2013. Retrieved 30 December 2014.
  17. ↑ Plaster, John (24 May 2014). "Testing The Army's M855A1 Standard Ball Cartridge". American Rifleman . National Rifle Association of America. Archived from the original on 20 January 2015. Retrieved 26 June 2018.
  18. 1 2 3 4 5 Dean, Glenn (2012-03-03). In Search of Lethality: Green Ammo and the M855A1 Enhanced Performance Round. SoldierGeek. ISBN   978-1-4660-5460-8.
  19. 1 2 "U.S. Army Begins Shipping M855A1 Enhanced Performance Round (M855A1 EPR) a.k.a. "Green Ammo" Improved 5.56mm NATO Round to Warfighters: Green Tip M855 Ball Ammo Gets a Serious Upgrade". DefenseReview.com. Archived from the original on July 2, 2010. Retrieved 2018-07-25.
  20. ↑ "New U.S. Army 5.56 Rounds Head to Afghanistan | Defense Media Network". Defense Media Network. Retrieved 2018-07-25.
  21. ↑ "'Green' ammo shipped to Afghanistan". Military Times. 2017-08-08. Retrieved 2018-07-25.
  22. ↑ One Less Spark One Less Wildfire. California Wildland Fire Coordinating Group. March 2015.
  23. ↑ "One Less Spark: Target Shooting Safety". California Department of Forestry and Fire Protection . Retrieved 14 November 2019.
  24. ↑ Cali, Damon. "Bullet Stability". Bison Ballistics. Retrieved 22 June 2018.
  25. ↑ Wood, Keith (2016-11-17). "How to Pair Barrel Twist Rates with Bullets". Guns & Ammo. Archived from the original on 25 April 2017. Retrieved 22 June 2018.
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