The new Rem 30 AR cartridge, advertised to shoot at 125 grain bullet at 2800 fps making a nice deer rifle in the compact AR15 package rather than the larger AR10. Here is an article about the ballistics of the cartridge:

http://accurateshooter.wordpress.com/2008/10/15/remington-introduces-new-30-remington-ar-cartridge/

http://accurateshooter.net/Blog/30rarchartop.png

But on the REMINGTON WEBSITE, they are listing a 125 grain bullet at 2154 fps!!! Not even on par with a 7.62 x 39!

http://www.remington.com/products/ammunition/centerfire/30_remington_ar.asp