27 June 2009, 02:59
madabulawill this replace the 50 BMG
From the White papers on the 408 CheyTac ® Cartridge:
Too large to post in full here in its entirety but will e-mail to anyone interested.
2. . The Ammunition The CheyTac® Cartridge was developed to fill the gap between the 338 Lapua and the .50 BMG, yet the downrange characteristics outperform the best .50 BMG projectiles. The projectiles are manufactured by Lost River Ballistic Technologies™ and are designed using PRODAS software. The projectiles are CNC, lathe turned,projectiles of a copper/nickel alloy. The 419grain projectile has a supersonic range of 2200 yards+ at standard air conditions. A second projectile is available - the 305grain projectile is designed for a high velocity near range application. The average ballistic co-efficient of the 419 projectile is .945 over 3500 meters..........
........... The CheyTac® LRRS as a Soft Target Interdiction System
The CheyTac® LRRS is a solid anti-personnel system to 2000 yards. The primary intent
of the .408 is as an extreme range anti-personnel system. Groups of 7” - 9” at 1000
yards, 10” at 1500 yards and 15” at 2000 yards have been consistently obtained. Groups
of 19” at 2100 yards and 29 “ at 2400 yards have also been obtained. All groups that are
up to 3000 yards are less than 1 minute of angle for vertical dispersion.......
.........The CheyTac® LRRS as an Anti-
Material Rifle3
The high remaining kinetic energy
characteristics of the 419grain projectile make it a very effective anti-material rifle. The .50 BMG has a higher initial muzzle energy of 11,200 ft. lbs. vs. the 408s energy of 7,700 lbs. At 700 yards however, the remaining energy of the 408 is higher than that of the .50 caliber rifle. Ranges past 700 yards are the realistic engagement-range for antimaterial rifles.....
The .408s 419grain projectile will defeat any material that the .50 BMG can defeat except those targets that require an explosive projectile. While the round of choice is the Raufoss for anti-material operations, there is a strong argument for use of solid projectiles for many of the material targets. Material targets such as surface to surface missiles can be easily engaged and defeated by the use of solid projectiles......
.......The CheyTac® Long Range Rifle System provides an outstanding value proposition. Loadedcartridges are priced at the 338 Lapua level. Additionally, loaded cartridges are much lighter than the .50 BMG cartridges. Four 50 BMG cartridges weigh 1 lb. while 7 .408 cartridges weigh 1 lb. The operator level maintenance of the entire system, including barrel replacement, provides logistical efficiency. Barrel replacement is as simple as calling CheyTac® Associates, LLC and ordering replacement .408 barrels......
Advantages of the .408 CheyTac®
cartridge over the .50 BMG cartridge
include:
• More compact
• 33% less weight
• Greater kinetic energy (beyond 400 yards)
• Shorter time to the target
• Greater velocity to the target
• Superior accuracy
• Engages targets at greater distances
• Remains supersonic longer for greater accuracy
• Less primary recoil due to lighter projectile
• Greater raw materials savings in manufacturing.
Advantages to the US Army of the CheyTac® rifles over the .50 BMG rifle include:
• Greater choice in rifle designs to fit combat missions
• Suppressed noise for silent shooting
• Requires less training than the bullpup design
• Ergonomically easier to shoot,thus improved accuracy
• Two turn-bolt receiver designs gives superior accuracy compared to a semi-automatic receiver design
• Greater reduction of secondary recoil (Advanced muzzle brake design)
• Does not expel gases into shooters’ eyes (Advanced muzzle brake design)
Powerful;
Note: The .50 Raufoss cartridge was designed as an improvement over the .50 Ball cartridge.
Data indicates that kinetic energy profiles are very similar.
The .408 CheyTac® kinetic energy surpasses the .50 Ball and the .50 Raufoss at
approximately 400 yards and maintains the lead beyond 2500 yards (1.42 miles).
In supervised tests, the .408 CheyTac® projectile penetrated armor and laminated glass
that was resistant to the .50 BMG projectiles (US Armed Forces Journal, August 2003)
Faster;
Note: The .50 Raufoss cartridge was designed as an improvement over the .50 Ball cartridge.
Data indicates that kinetic energy profiles are very similar.
At 1000 yards the .408 CheyTac® projectile exceeds the .50 BMG projectile by
approximately 1 second and at 2500 yards (1.42 miles) by approximately 1.5 seconds.
More Stable;
Note: The .50 Raufoss cartridge was designed as an improvement over the .50 Ball cartridge.
Data indicates that kinetic energy profiles are very similar.
The .408 CheyTac® projectile was designed to penetrate the atmosphere with the least
amount of resistance. It remains supersonic to 2400 yards, while the .50 Ball and the .50
Raufoss projectiles remain sonic to only 1700 yards.
The .408 CheyTac® projectile remains stable as it passes through the transonic zone and
remains on its original trajectory path (Patented Balanced Flight Process). However, the
.50 Ball and .50 Raufoss projectiles undergo extensive vibrations through the transonic
zone, resulting in their departure from their original trajectory paths.
Impressive or Awesome not sure which!
28 June 2009, 04:23
tiggertateYou betcha! 30 caliber tungsten projectile at 3985 feet per second. They were developed in the 80's to defeat more armor (2 to three times more than standard AP at any given range) and against armored aircraft.
They are called SLAP or SLAPT (tracer) and serve a different function than the 408, very effective and they function in the M2 in full auto nas well as dedicated rifles. Doubtful if they can be shot as accurately as the 408.
28 June 2009, 10:57
N E 450 No2From what I understand you cannot shoot SLAP ammo in a KDF type brake either.
It would have to be something like Magna Port, where the "holes" are not larger than bore diameter.
Nothing under the 50 BMG can replace it for "STUFF".
At least with present technology.
08 July 2009, 02:11
CollinsHere's a real live Winchester SLAP round:
0.303" Tungsten (Not Tungsten Carbide) Penetrator
360 grains.
.
.
.
.
It goes pretty well. I wondered how that hard plastic would grip the tungsten so the rifling would have some effect and found a small square of aluminum in the Sabot. My theory is when fired the aluminum deforms and grabs the bullet by the notch on the bottom. my $0.02
On the Chey Tac... the "installed Base" on the BMG is too large. When the BMG becomes outlawed I'm gonna get a 458 bbl for mine.
For a Laugh, go here...
http://forums.accuratereloadin...=489105786#489105786Don't shoot a Steyr without a brake!
01 October 2009, 19:07
billtThe .50 BMG will no more be replaced by the .408 Chey-Tac or .416 Barrett, than the .45 ACP will go away because of the .45 GAP. It has a strangle hold on availability because it is a military round. On paper the high performance .408's and .416's look better, but that alone doesn't sell cartridges. These specialty rounds are hard to find ammo and components for, and will remain that way because of limited sales. .50 BMG rifles and ammo, while expensive, are still within many shooters financal framework. Bill T.