New Cartridge Developments and Implications for Dismounted Infantry Soldiers

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That being said i am not sure if they went with the grendel what grain projectile they would use, maybe a 100-110gr to keep velocity high?

If 6.5 Grendel were to be adopted, it seems likely that bullet weight would be in that range, or perhaps even a bit lighter.

That's because with a lead-free projectile of the EPR type, bullets heavier than 110 grains would extend rather deep into the case, using up propellant space.

For example, note how long is the base of the 123-grain EPR bullet in CT ammo.