I've got two sets of .223 formed .300 Blackout brass, about 400 pieces from Hoser and 500 pieces from an online source. Brass is sized, and within specs for case length and neck size. Empty case fits in Lyman case length gauge, as do the loaded rounds (110 VMAX, 2.05" COAL). The loaded rounds chamber but won't eject, and have to be banged out. Factory Hornady ammo fits in the gauge and ejects easily. Factory ammo is on left. Any ideas?


.300 brass (2).jpg