Lets start over: how do you design a GPC?

[stanc]

Do you want to design a new GPC, or a new system?

Because cartridge size would preclude use in 5.56 rifles and carbines, a new GPC would necessarily require development of a new individual weapon. Possibly, existing 7.62 rifles and machine guns could be converted to fire the GPC.

Is your only parameter a smaller case to outperform the 7.62 NATO? A cartridge that is essentially 60 years old? In what ways? Penetration? Range? BC? Felt recoil?

I'm not trying to be a killjoy. I also understand from reading your posts you really know your stuff... BUT... if you are truly going after something to seriously change the DoD's mind about the 5.56, you need to come out with something a lot more significant than outperforming a cartridge that has been around almost as long as the television.

It appears you do not understand the premise for the GPC concept. The idea is not to outperform 7.62 NATO. It is to provide equal performance, but with a substantial reduction in weight.