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標題: 巨口徑? [打印本頁]

作者: MS 時間: 26-4-2008 00:01 標題: 巨口徑?

下7.62mmX51
Steyr 15.2mm cartridge schematic

Caliber(s): 15.2mm Steyr APFSDS
Operation: long recoil, semi-automatic
Barrel: 1200 mm
Weight: 18 kg
Length: 1800 mm
Feed Mechanism: 5 rounds detachable box mag.

The development of this interesting weapon began in mid-1980s, when Austrian company Steyr-Mannlicher AG decided to develop a long-range anti-materiel rifle (AMR) - a modern equivalent of the WW2-era antitank rifles. Main targets for AMR are light armoured vehicles, helicopters, installations such as radar cabins, missile launchers, fuel tanks etc. To achieve desired effective range of at least 1000 meters, Steyr engineers first decided to use APDS (armour piercing, discarding sabot), or sub-caliber, ammunition. Development started from 12.7mm cartridges, and later Steyr developed a 14.5mm APFSDS (Arnour percing, fin stabilised, discarding sabot) ammunition in 14.5mm caliber and built few prototypes with smooth bores and semi-automatic actions, called Steyr AMR 5075. Further development led to even bigger caliber of 15.2mm fith same ultra-high velocity APFSDS projectiles. This system is called Steyr IWS 2000 (Infantry Weapon System 2000) and currently is probably in Adsvanced Development status or ready for adoption.

IWS 2000 is wery formidable weapon. It fires 20 gramm (308 grains) tungsten dart (fleschette) with muzzle velocity of 1450 meters per second (4750 fps). At 1000 meters this projectile will penetrate a 40 mm of RHA (rollded homogenous steel armour) and will result in serious secondary fragmentation effect behind the armour. That said, it will penetrate two walls of any modern APC at one kilometer range. The trajectory is very flat and does not rise higher than 800 mm above the line of sight when fired to 1000 meters. The cartridge is of somewhat original design, and has plastic case with steel head and base. The projectile is concealed within a plastic sabot.

The rifle itself also is very interesting. Firs, it uses rare long-recoil system, when barrel recoils along with the bolt for significant lenght. At the end of the recoil, bolt unlocks from the barrel by rotating and held back, and barrel returns into forward position, ejecting a spent case. Bolt stays at the rearmost position while barrel moves, and then also moves forward, chambering a new round from the side-mounted magazine and finally locking rigidly to the barrel. This design allows for better recoil disttibution over a longer period of time. Huge muzzle brake also contributes to recoil control, so felt recoil of the IWS 2000 is descibed as a similar to the large-caliber sporting rifle. Five round detachable box magazine is located at the right side of the receiver and inclined down for about 45 degrees. The smooth-bore barrel can be easily detached, so rifle can be carried disassembled into two man-portable packs. Plastics are used where possible to reduce the weight of the gun. IWS 2000 is equipped with bipod and a rear leg under the buttstock. It is also equipped with 10X telescope as a standard.

This is probably the most powerful modern anti-materiel rifle, and while it is not a true "sniper" rifle, it is well worth mentioning. The future of this design is also unclear, sice it requires ammunition of a brand new type.

[ 本帖最後由 mswong 於 26-4-2008 00:07 編輯 ]

作者: zeta 時間: 26-4-2008 00:17

仲有20mm

但20mm彈比較短

作者: MS 時間: 26-4-2008 01:59

Steyr .50HS heavy sniper rifle, with folded bipod
Caliber: .50BMG (12.7x99mm) or .460Steyr
Operation: manually operated rotating bolt action
Barrel: 833 mm (33")
Weight: 12.4 kg
Length: 1370 mm (54")
Feed Mechanism: single shot, no magazine

The Steyr .50 HS is the most recent development of the famous Austrian arms manufacturer, the Steyr Mannlicher Gmbh & Co KG. First displayed at the ShotShow-2004 (February 2004, Las-Vegas, USA), this single shot rifle is primary intended for anti-material applications and counter-sniping. The Steyr .50HS is available in two calibers, the old and venerable .50BMG and the apparently new .460Steyr (on which so far no data were obtained).

The Steyr .50 HS is a single shot rifle, with manually operated, rotating bolt with two large locking lugs at the front. The two-stage trigger is factory set to 4lbs (1.8kg). The buttstock is adjustable for length of pull, the cheekpiece is also adjustable. Heavy barrel is partially fluted and fitted with effective muzzle brake. Steyr .50 HS has no iron sights; the MilStd Picatinny rail is standard. Rifle is not intended to be fired off-hand; it is fitted with integral folding adjustable bipods.

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[ 本帖最後由 mswong 於 26-4-2008 02:03 編輯 ]

作者: MS 時間: 26-4-2008 02:08

M99 anti-materiel / sniper rifle
Caliber(s): 12,7x108 (M99-I) or 12,7x99 / .50BMG (M99-II)
Operation: gas operated semi-automatic
Barrel: mm
Weight: ~12 kg (unloaded, less telescope sight)
Length: 1500 mm
Feed Mechanism: 5-round detachable box magazine

The M99 rifle is offered as anti-materiel / anti-sniper weapon, and is available in two calibers - 12,7x108 (M99-I) and 12,7x99 / .50BMG (M99-II). No firm facts are available on accuracy of this weapon, but it is believed that it shoots about 2 MOA with Chinese standard issue ammunition. This is way below Western "sniping" standards but more or less enough for anti-materiel work or short-range enemy snipers suppression.

Not much information is available on internals of this rifle, although it is believed that it uses gas operated action with tipping bolt locking. Feed is from detachable box magazines holding five rounds of ammunition. Rifle is fitted with adjustable bipod, adjustable rear monopod, and buffered buttstock. Top of receiver is fitted with Picatinny style rail which will accept a variety of sighting equipment on appropriate mounts. Typical sighting set-up includes either a 10X fixed power telescope or 4-12X or 7-22X variable power telescope sights

[ 本帖最後由 mswong 於 26-4-2008 02:28 編輯 ]

作者: 皇家御貓 時間: 26-4-2008 02:38

其實民用槍械有12.7 x 99/108mm口徑嗎?

作者: zeta 時間: 26-4-2008 17:01

引用:

原帖由 皇家御貓 於 26-4-2008 02:38 發表
其實民用槍械有12.7 x 99/108mm口徑嗎?

美國有架
不過只可以係round
而且多數係用黎比賽用

作者: workshop_swt 時間: 27-4-2008 23:43

比賽都用咁12.7

可以講解下嗎................唔該

作者: zeta 時間: 28-4-2008 11:05

引用:

原帖由 workshop_swt 於 27-4-2008 23:43 發表
比賽都用咁12.7
可以講解下嗎................唔該

美國係有d長距離大口徑射擊比賽架

作者: workshop_swt 時間: 1-5-2008 00:17

引用:

原帖由 zeta 於 28-4-2008 11:05 發表

美國係有d長距離大口徑射擊比賽架

明白............thx

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