I just found this:
http://www.lwrci.com/Technology/Why68mmSPC/tabid/91/Default.aspx
"The 6.8 x 43mm SPC round was developed to address the well known terminal performance problems of the 5.56mm M855 62gr "Green Tip" ammunition and its failure to rapidly incapacitate opponents in a timely and decisive manner.
6.8 SPC was designed and developed by warfighters for warfighters. The round was designed to give much better terminal performance than the 5.56mm round, without the increased recoil and the much larger weapon platform of the 7.62 x 51mm round. The 6.8 SPC has superior terminal ballistics out to 600 meters and yet can be easily adapted to the AR style platform. Thus, the 6.8 SPC combines the best feature of both the 7.62 x 51mm and the 5.56 rounds without either of their deficits.
We at LWRCI™ were ahead of the curve when we realized the incredible advantage the 6.8 SPC round gave the modern warfighter, LE Officer or serious sportsman. Couple this modern, effective and efficient round with the LWRCI™ short-stroke gas-piston design and you have a match made in Heaven.
The 6.8 x 43 mm SPC combines the best features of both the 7.62 x 51 mm cartridge and the 5.56 mm cartridge without either of their deficits.
Current accuracy, terminal ballistic, and operator testing indicates that the 6.8 x 43 mm SPC cartridge is extremely accurate and offers superior terminal performance and improved incapacitation capability at ALL ranges (0 to 600 meters) as compared to ALL available 5.56 mm ammunition.
With it's improved accuracy, lethality, and reliability, the 6.8 mm SPC is without question the optimum overall cartridge choice for military rifles and carbines."
This is what they have on their website about the 6.8 SPC!!!
http://www.lwrci.com/Technology/Why68mmSPC/tabid/91/Default.aspx
"The 6.8 x 43mm SPC round was developed to address the well known terminal performance problems of the 5.56mm M855 62gr "Green Tip" ammunition and its failure to rapidly incapacitate opponents in a timely and decisive manner.
6.8 SPC was designed and developed by warfighters for warfighters. The round was designed to give much better terminal performance than the 5.56mm round, without the increased recoil and the much larger weapon platform of the 7.62 x 51mm round. The 6.8 SPC has superior terminal ballistics out to 600 meters and yet can be easily adapted to the AR style platform. Thus, the 6.8 SPC combines the best feature of both the 7.62 x 51mm and the 5.56 rounds without either of their deficits.
We at LWRCI™ were ahead of the curve when we realized the incredible advantage the 6.8 SPC round gave the modern warfighter, LE Officer or serious sportsman. Couple this modern, effective and efficient round with the LWRCI™ short-stroke gas-piston design and you have a match made in Heaven.
The 6.8 x 43 mm SPC combines the best features of both the 7.62 x 51 mm cartridge and the 5.56 mm cartridge without either of their deficits.
Current accuracy, terminal ballistic, and operator testing indicates that the 6.8 x 43 mm SPC cartridge is extremely accurate and offers superior terminal performance and improved incapacitation capability at ALL ranges (0 to 600 meters) as compared to ALL available 5.56 mm ammunition.
With it's improved accuracy, lethality, and reliability, the 6.8 mm SPC is without question the optimum overall cartridge choice for military rifles and carbines."
This is what they have on their website about the 6.8 SPC!!!