Maximum Effective Range

[stanc]

Found this (a portion only) on wikipedia about the M24 Sniper Weapon System.
My take on it is that Maximum Effective Range as a military standard is only about accuracy. So if you want a Grendel MEF, start with an accepted standard of accuracy and you will be able to calculate or test what it's MEF is.

The accuracy standards you cite are for a bolt-action sniper rifle with 24" barrel, firing match grade ammo. It would seem reasonable to use those standards as a basis for a 6.5 Grendel sniper rifle, but they are totally inapplicable to determining the maximum effective range of a service grade 6.5 Grendel carbine with 16" barrel, firing service grade ball ammo.

You need to use the standards for 5.56 M855A1 Ball. The weight range of hypothetical EPR bullets has practical limits of around 95 gr at the low end, to about 125 gr at the high end. Considering the probable BC and MV of such loads, the max effective range seems likely to not differ greatly from that of 5.56 ball ammo.