New Army "Caliber Configuration Study"

[stanc]

This is why I say to base the performance match or over match on 7.62x54R out of the PKM, which has a 25.4" barrel, as well as the SVD with 24.4" barrel, and the SVDS with 23" barrel.

I think that would make the comparison even worse. I haven't done the calculations, but it seems very unlikely to me that 6.5 Grendel, with a 108gr ball projectile fired from a 14" or 18" barrel M249, or 16" barrel M27, would be able to match -- let alone overmatch -- those weapons.