Nope -- completely missed that.
I know that Mk319 mod 0 was specifically designed for SBR .308/7.62x51, a 130 gr OTM bullet and powder designed for SBR.
I don't know as much about the Army's M80A1, with it's 130 gr Steel Penetrator, Copper Slug, and Copper Jacket bullet, but it's at least a reduced recoil round.
But IIRC, the M80A1 bullet costs significantly more than the all copper mk 319.