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Reply Hangar 1: Infantry Weapons/ Armor- And Attachment weapons
.338 Lapua Magnum Caseless

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Iamnotsuicidesoldier1
Crew

PostPosted: Sun Dec 03, 2017 6:01 am


Parent case: .338 Lapua Magnum
Case type: Caseless
Bullet diameter: 8.58mm (.338 inch)
Neck diameter: 9.46 mm (0.372 in)
Shoulder diameter: 13.82 mm (0.544 in)
Base diameter: 14.91 mm (0.587 in)
Case length: N/A
Overall length: 76.2mm (3 inches)
Rifling twist: 1: 10 inches (1 in 254 mm)
Primer type: Large Rifle (Combined with Hexagon)
Cartridge Weight: 21.4 grams, 25 grams
Powder Weight and Kind: 86 H2O grains (5.6 grams) AA2520 powder with a Hexagon binder
Projectile Weight: 16.2 grams (250 grain), 19.44 grams (300 grain)
Velocity: 936 m/s - 855 m/s (27.5 inch - 700mm barrel)
Energy: 7,100 joules
PostPosted: Sun Dec 03, 2017 6:01 am


Basic Bullet Information


The rounds are all coated in a Tombac full metal jacket and given a slight Molybdenum disulfide coating to ease the movement of the round through the barrel and with loading. While "Teflon" (Really Molybdenum Disulfide) is said to have or give special armor piercing qualities to a bullet, it's purpose more or less decreases friction in the barrel, which consequently decreases barrel wear, and can also increase velocity or accuracy depending on the type of barrel. Because of it's Molybdenum Disulfide coating, all rounds thus appear black, except for their tips (which are left revealed to help signify the type of round). The Molybdenum Disulfide coating is crucial in the fact that is does not wear off or leave behind substantial amounts of residue when fired, and that it can resist temperatures of over 350 degrees Celsius, which similar materials, such as Teflon, cannot. Each round is roughly 16.2 grams and has a spitzer point, with a boat tail to help stabilize the round in flight, as they are intended for long range. The caseless propellant is held together with a Hexagon or RDX binder, which causes the propellant to be far less sensitive then it would otherwise be (reducing the chance of a cook-off tremendously). The round can also achieve it's fully velocity from a shorter barrel, as the propellant burns faster than from a standard .338 Lapua round.

The .338 Lapua is known for being a relatively accurate and powerful cartridge, with an incredibly high ballistic coefficient and incredible long range capabilities. While the casless variant is not identical to the original .338 Lapua, it is very similar in performance, being slightly more powerful and more widely utilizing sniper variants of the cartridge (although with a dramatically different case shape). Utilizing a round with very similar ballistic shape to the LockBase B408 250 grain (16.2 gram) round, with a G1 ballistic coefficient of .76, and a muzzle velocity of 900 to 940 m/s, the round has an incredibly long range, possessing approximately 3,500 joules at 800 yards (.5 miles) or more than a 7.62mm x 51mm NATO cartridge, and 1800 joules at over 1500 yards (.85 miles), roughly equal to a 5.56mm. The round is supersonic out to 2100 yards (1.2 miles), and is hitting the target with the same force of a .357 magnum at this range. At 3500 yards (roughly 2 miles) the round is hitting with the same force as a .45 ACP, however due to the incredible bullet drop it is impractical to hit a target at this range, limiting the maximum effective range of the weapon to 2600 yards, or roughly 1.5 miles. The incredibly flat trajectory and high energy efficiency gives the weapon an incredibly long range, and with the HEIAP rounds can penetrate armor that is traditionally resistant to normal .308 caliber rounds, and even .338 lapua rounds. While not as aerodynamic or long range as the .50 caliber BMG, the round can still penetrate light armor, such as level III body armor worn by soldiers out to 1100 yards. This makes it uniquely suited for the antipersonnel role, where the incredible power and armor penetration allows it to easily take targets out to and over a mile. The round's effective range is approximately 2100 yards, which allows it to easily engage enemy snipers or machine gunners that traditionally have been able to outshoot the .308 round. Blurring the lines between a machine gun and sniper rifle round, the weapon is able to perform in a variety of different roles, and is extremely effective in the anti-personnel and material role.



Armor piercing D11
These types of rounds are the basic load, with relatively normal composition and price; they would also be something that a hunter or standard military unit might use. The rounds are essentially Tombac covered Molybdenum Disulfide coated Lead-Steel rounds, with a red tip to signify it's type. The round is basically lead steel and deforms regularly in soft tissue, except for the fact that it has a steel penetrator in the center of the round (unlike the normal rounds, which possess no kinetic energy penetrators). The steel penetrator rarely is exposed when the ordinary lead steel round passes through soft tissue, however, when the round is pressed against a hard target, the lead-steel deforms and "Peels back" which allows the steel penetrator to pass, and carry the kinetic energy of the round into the steel penetrator which is much better at piercing hard targets. This type of round can pierce soft tissue and deliver relatively high amounts of damage, yet when pressed against a hard target they have the ability to penetrate with general ease.

The steel penetrator is essentially 4.1 grams and has a base diameter and shape of a standard 5.56mm x 45mm NATO round. The rest of the lead steel and tombac coating brings the weight of the round to roughly 16.2 grams, or is 12.1 grams. The rounds are similar in style and composition to that of the 5.56mm NATO German D11 round.




"Black Talon" Shredder Rounds
The rounds are essentially based off the Black Talon rounds that Winchester made a while ago. The rounds were of course, extremely deadly and their reputation for being exceptionally deadly produced a wide variety of rumors, many of which were completely opposite to the truth, which lead Winchester to formally discontinue the creation and sale of the rounds. The Shredder rounds are essentially jacketed hollow-point bullets with perforations designed to expand sharp edges upon impact and silicon spitzer points designed to nearly disintegrate upon impact regardless of the hardness of the target (the spitzer point of course, to increase the aerodynamic shape of the bullet). The bullet includes a Molybdenum Disulfide coating, a proprietary oxide process, which gives it an unusual black appearance compared to copper-jacketed or lead bullets. The Molybdenum Disulfide coating was to protect the barrel rifling, and did not give the bullet armor-piercing capabilities. This coating in fact is still widely used on many of Winchester's rifle bullets today. The bullet also had a unique appearance with a star shaped perforation on the black tip, giving it the nickname Starpoint. The internal structure of the Black Talon’s hollow point is unique in that its petals are more massive at their tips, after expansion, than comparable bullets. This added mass provides superior expansion compared to most other hollow points including the “Ranger SXT”.

The Five Star petal shapes of the Black Talon Shredder rounds essentially translate into superior expansion and very controlled expansion in most soft tissue materials, allowing for a greatly increased, reliable soft targets. In particular, the rounds usual ability to penetrate basically translates into greater expansion, with the energy spent on penetration translating into greater expansion and less penetration. Even so, the extreme power of the round typically results in over-penetration in most soft targets. The rounds are similar in shape to many sniper bullets for the .338 Lapua magnum, being a boat-tail hollowpoint which gives the weapon significantly greater aerodynamic efficiency.




High Explosive Incendiary Armor Piercing Rounds (HEIAP)
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High Explosive Incendiary/Armor Piercing Ammunition (HEIAP) is a form of shell which combines both an armor piercing capability and a high explosive effect. In this respect it is a modern version of armor piercing shell. The ammunition may also be called Semi-armor piercing high explosive incendiary (SAPHEI). Typical of a modern HEIAP shell is the NM142 MP Mk 208 Mod 1 round designed for weapons such as heavy machine guns and anti-materiel rifles.

The primary purpose of these munitions is armor penetration, but unlike SLAP rounds (Saboted Light Armor Penetrator) which get their armor piercing ability from the propulsion of a 5.56mm tungsten heavy alloy bullet from a 7.62mm barrel using a sabot with much more energy than is usually possible from a 5.56mm round, HEIAP munitions use high explosives to "blast a path" for the penetrator. The special effect is developed when the round strikes the target. The initial collision ignites the incendiary material in the tip, triggering the detonation of the HE charge. The second (zirconium powder) incendiary charge will also ignite. This burns at a very high temperature, is not easily extinguished, and can last for 30 seconds.

The remaining element of the round is the tungsten carbide penetrator. This has a large amount of kinetic energy and will penetrate the armor as solid-cored armor piercing shot would. This will take some of the incendiary material through the armor. The MK 211 is claimed to penetrate up to an inch (25.4mm) of rolled homogeneous armor. The triggering of the explosive charge is dependent upon the resistance of the target. If the target offers little resistance then the lack of frictional heating will prevent the incendiary from igniting and the high explosive from detonating. Larger guns such as the British 30 mm RARDEN cannon fire APSE (Armour Piercing Special Effects) shells which are an armor piercing round with added HE effect.

This round is usually identified by a green over white paint tip mark. A rarer occurrence of a green–over red–over white paint mark scheme indicate the tracer version of this round. These tracer versions are usually only seen on cartridge feed belts in naval applications. The headstamp on the casing can also help to identify the round as Raufoss and some common headstamps include, but not limited to: HXP89, WCC94, and FN91; or HXP, WCC, LC, or FN with different two-digit numbers as production year suffixes. This round is usually identified by a green over white paint tip mark. A rarer occurrence of a green–over red–over white paint mark scheme indicate the tracer version of this round. These tracer versions are usually only seen on cartridge feed belts in naval applications. The headstamp on the casing can also help to identify the round as Raufoss and some common headstamps include, but not limited to: HXP89, WCC94, and FN91; or HXP, WCC, LC, or FN with different two-digit numbers as production year suffixes. The round itself is essentially a 16.2 gram container, and has roughly the same proportions of materials as the Raufoss Mk 211 cartridge. This gives the cartridge the ability to penetrate armor in a roughly equivalent manner to a standard .50 caliber AP round (or around .5 inches of RHA steel), although obviously this is substantially less than the .50 caliber HEIAP round.

Iamnotsuicidesoldier1
Crew

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Hangar 1: Infantry Weapons/ Armor- And Attachment weapons

 
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