Grendel as a Universal Infantry Cartridge

[Trooper]

Look to have a general purpose (universal) cartridge it is going to have to be between 6.5 and 7mm. The 6.5mm works better due to less recoil.

The next aspect is getting the round to 2500 fps out of the barrel using a 140 grain bullet. That is the standard, set by the 6.5x55 Swedish Mauser. So far the .260 Rem, the 6.5 Creedmoor and and the 6.5x47 Laupa meet those requirements but with longer cases. As do wildcats like the 6.5 BRM which is based on the .30-30 case. The problem is that we can get a 140 gn. bullet to go 2500 but it takes a longer case than would fit into the current AR platform.

So could we make 6.5mm GPC that pushes a 140 gn. bullet 2500 fps? And make it smaller than a .308 (7.62x51)?