Sellier & Bellot Exergy Blue Bullet, Rifle Ammunition, 300 Blackout, 110 Grains, Lead Free Tipped Boat Tail, 20 Rounds per Box, 1000 Rounds per Case SB300BLKXA New generation lead free bullets. Modern, highly efficient design incorporating a boat-tail base with a new, pointed tip for a flat trajectory and maximum retained energy. Blue plastic tip enhances expansion at all ranges while the solid copper construction maximizes weight retention.