Magpul will soon release a 7.62mm Drum Magazine in the form of the Magpul PMAG D-50 LR/SR... "The Magpul PMAG D-50 is a rugged, lightweight 50-round polymer drum magazine designed for 7.62x51 NATO/.308 Winchester ammunition for SR25/M110 pattern rifles. It’s capable of using longer-than-SAAMI-spec match ammunition, up to 2.830” OAL, such as M118LR.