New Cartridge Developments and Implications for Dismounted Infantry Soldiers

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3) Cartridge weighs less than 7.62 NATO, allowing at least a 20% threshold increase in ammunition carrying capacity in linked form, with an objective of 30%...without losing any elevation trajectory or penetration of equal mediums at 700m

Ammo carry weight seems as if it should be easy to achieve. Tony Williams' envisions his proposed 6.5x45 GPC as being made from a slightly "stretched" 6.8x43 SPC case ( http://www.quarry.nildram.co.uk/The%20Ne...ration.htm ), which would give it a weight of ~280 grains. Since 7.62x51 M80 is 392 grains, the 6.5x45 ought to permit 40% more rounds to be carried.

And, I estimate that Cris Murray's 7x46 UIAC ( http://www.thefirearmblog.com/blog/2010/...cartridge/ ) would weigh ~300 grains, which still allows 30% more ammo to be carried.

However, it remains to be seen if the trajectory requirement can be met with (FMJ or M855A1-type) ball ammo. Also, AFAIK penetration capability of 6.5mm and 7mm ball has yet to be adequately tested.