6×45mm SAW: Difference between revisions
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|name=6mm SAW |
|name=6mm SAW |
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|image= [[Image:280britishcompare.jpg|300px]] |
|image= [[Image:280britishcompare.jpg|300px]] |
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|caption=From left to right: 6mm SAW, [[6.5 Grendel]], [[6.8 SPC]], [[7mm BR Remington|7mm Bench Rest]], [[.280 British|.280/30 British]], [[7mm-08]], [[.280 British|7mm Second Optimum (Liviano)]], [[.276 Pedersen]], .308x1.75", [[7.62x51 NATO]]. |
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|caption=6mm SAW, first on left. |
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|origin={{flagcountry|United States}} |
|origin={{flagcountry|United States}} |
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|type= Rifle |
|type= Rifle |
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Note that the dimensions listed to the right are for 6×45mm SAW rounds.<ref>[http://www.municion.org/6Mm/6x45Saw.htm Municion.org on the 6x45mm SAW] [http://translate.google.com/translate?hl=en&sl=es&u=http://www.municion.org/6Mm/6x45Saw.htm (translated)]</ref> Three versions were produced for testing in the early 1970s. An aluminum-cased version was developed, as well as the '''6mm SAW Long''' which was slightly longer (by about 5 mm)<ref>[http://www.municion.org/6Mm/6x50Saw.htm Municion.org on the 6x50mm SAW Long] [http://translate.google.com/translate?hl=en&sl=es&u=http://www.municion.org/6Mm/6x50Saw.htm (translated)]</ref> |
Note that the dimensions listed to the right are for 6×45mm SAW rounds.<ref>[http://www.municion.org/6Mm/6x45Saw.htm Municion.org on the 6x45mm SAW] [http://translate.google.com/translate?hl=en&sl=es&u=http://www.municion.org/6Mm/6x45Saw.htm (translated)]</ref> Three versions were produced for testing in the early 1970s. An aluminum-cased version was developed, as well as the '''6mm SAW Long''' which was slightly longer (by about 5 mm)<ref>[http://www.municion.org/6Mm/6x50Saw.htm Municion.org on the 6x50mm SAW Long] [http://translate.google.com/translate?hl=en&sl=es&u=http://www.municion.org/6Mm/6x50Saw.htm (translated)]</ref> |
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==Design and development== |
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During the 1970s, the U.S. Army was looking to develop a new [[squad automatic weapon]] (SAW). They wanted a lighter machine gun than the 7.62 mm [[M60 machine gun]], with an effective range out to 800 m, longer than the 5.56 mm could provide. Research led to the development of the 6×45mm SAW cartridge. Its {{convert|105|gr|g}} bullet had a muzzle velocity of {{convert|2,520|ft/s|m/s}}. The relatively heavy bullet combined with a moderate velocity had optimum long-range performance. A light-alloy cased version of the round was also produced. Because [[aluminium]] alloy had a tendency to catch fire, the length was extended to {{convert|50|mm|in|abbr=on}} to make up for loss in capacity caused by the need to line the inside of the case with fire-resistant material. Although the 6mm SAW's performance proved satisfactory, their were supply concerns over adopting a third rifle caliber. Development of the 6mm SAW was abandoned when an improved 5.56 mm round was promised, which arrived as the [[5.56 NATO#SS109/M855|M855]].<ref>[http://www.quarry.nildram.co.uk/The%20Next%20Generation.htm The Case for a General-Purpose Rifle and Machine Gun Cartridge (GPC) by Anthony G Williams]</ref><ref>[http://www.quarry.nildram.co.uk/Assault.htm ASSAULT RIFLES AND THEIR AMMUNITION: HISTORY AND PROSPECTS by Anthony G Williams]</ref><ref>[http://www.quarry.nildram.co.uk/256brit.htm THE .256 INCH BRITISH: A LOST OPPORTUNITY by Anthony G Williams]</ref><ref>http://www.lead-slinger.com/pdf/62OCC.pdf</ref> |
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==See also== |
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[[6×45mm]] |
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==References== |
==References== |
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Revision as of 22:58, 25 September 2013
| 6mm SAW | |
|---|---|
 From left to right: 6mm SAW, 6.5 Grendel, 6.8 SPC, 7mm Bench Rest, .280/30 British, 7mm-08, 7mm Second Optimum (Liviano), .276 Pedersen, .308x1.75", 7.62x51 NATO. | |
| Type | Rifle |
| Place of origin |  United States |
| Production history | |
| Designer | Frankford Arsenal |
| Designed | Early 1970s |
| Specifications | |
| Bullet diameter | 6.17 mm (0.243 in) |
| Neck diameter | 6.63 mm (0.261 in) |
| Shoulder diameter | 9.72 mm (0.383 in) |
| Base diameter | 10.26 mm (0.404 in) |
| Rim diameter | 10.36 mm (0.408 in) |
| Case length | 45.01 mm (1.772 in) |
| Overall length | 65.54 mm (2.580 in) |
| Primer type | Boxer |
The 6mm SAW describes an experimental series of cartridges developed in the 1970s for the U.S. Army. The cartridges were produced in a variety of sizes and from a variety of materials. The intent was to develop a cartridge that would replace all 5.56×45mm NATO weapons as well as most 7.62×51mm NATO rifles and machine guns in the U.S. military. Eventually, the 5.56mm was retained and only the machine gun portion of the SAW (Squad Automatic Weapon) competition was successful. That program led to the M249 light machine gun.
Note that the dimensions listed to the right are for 6×45mm SAW rounds.[1] Three versions were produced for testing in the early 1970s. An aluminum-cased version was developed, as well as the 6mm SAW Long which was slightly longer (by about 5 mm)[2]
Design and development
During the 1970s, the U.S. Army was looking to develop a new squad automatic weapon (SAW). They wanted a lighter machine gun than the 7.62 mm M60 machine gun, with an effective range out to 800 m, longer than the 5.56 mm could provide. Research led to the development of the 6×45mm SAW cartridge. Its 105 grains (6.8 g) bullet had a muzzle velocity of 2,520 feet per second (770 m/s). The relatively heavy bullet combined with a moderate velocity had optimum long-range performance. A light-alloy cased version of the round was also produced. Because aluminium alloy had a tendency to catch fire, the length was extended to 50 mm (2.0 in) to make up for loss in capacity caused by the need to line the inside of the case with fire-resistant material. Although the 6mm SAW's performance proved satisfactory, their were supply concerns over adopting a third rifle caliber. Development of the 6mm SAW was abandoned when an improved 5.56 mm round was promised, which arrived as the M855.[3][4][5][6]
See also
References
- ^ Municion.org on the 6x45mm SAW (translated)
- ^ Municion.org on the 6x50mm SAW Long (translated)
- ^ The Case for a General-Purpose Rifle and Machine Gun Cartridge (GPC) by Anthony G Williams
- ^ ASSAULT RIFLES AND THEIR AMMUNITION: HISTORY AND PROSPECTS by Anthony G Williams
- ^ THE .256 INCH BRITISH: A LOST OPPORTUNITY by Anthony G Williams
- ^ http://www.lead-slinger.com/pdf/62OCC.pdf
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