4501 .50 Beowulf 10 HP .50 Bewoulf Magazine, 10 HP A conversion of the standard 30 round NATO 5.56 magazine to take 10 rounds of the HP .50 Beowulf ammunition. .50 Beowulf 10 HP Alexander Arms' 10 rounds magazine of HP .50 Beowulf ammunition. 1024 386 1 748 3 4 20 120 5 1 1 1 6 -10 2 6 386 38 10 1