If you run a high-round-count training regimen or need dependable ammunition for range sessions, the SB 5.56 NATO 55-Grain FMJ ammunition delivers straightforward, reliable performance without excess cost. Sellier & Bellot has built a reputation for consistent quality across European and global markets, and this offering keeps that standard. The 55-grain full metal jacket load pairs the classic intermediate velocity and trajectory of 5.56 NATO with a proven bullet design suited to AR-15s, M4-pattern rifles, and other modern sporting rifles chambered in the caliber.

The full metal jacket construction means the lead core is encased in a copper jacket, making it ideal for high-volume shooting where fouling and cost are real considerations. FMJ rounds are also commonly preferred at indoor ranges due to their design and predictability downrange. With 20 rounds per box and this purchase unit containing 50 boxes, you're buying in volume—a smart move if you're serious about training or zeroing work.

Brass cases and small rifle primers provide the foundation for consistent ignition and reloadability if that's part of your ammunition strategy. The 0.272 ballistic coefficient is typical for the 55-grain projectile weight and indicates moderate wind resistance—not extreme long-range performance, but entirely adequate for what this round is engineered to do: deliver rounds downrange reliably during practice and qualification-style shooting.

If you run a high-round-count training regimen or need dependable ammunition for range sessions, the SB 5.56 NATO 55-Grain FMJ ammunition delivers straightforward, reliable performance without excess cost. Sellier & Bellot has built a reputation for consistent quality across European and global markets, and this offering keeps that standard. The 55-grain full metal jacket load pairs the classic intermediate velocity and trajectory of 5.56 NATO with a proven bullet design suited to AR-15s, M4-pattern rifles, and other modern sporting rifles chambered in the caliber.

The full metal jacket construction means the lead core is encased in a copper jacket, making it ideal for high-volume shooting where fouling and cost are real considerations. FMJ rounds are also commonly preferred at indoor ranges due to their design and predictability downrange. With 20 rounds per box and this purchase unit containing 50 boxes, you're buying in volume—a smart move if you're serious about training or zeroing work.

Brass cases and small rifle primers provide the foundation for consistent ignition and reloadability if that's part of your ammunition strategy. The 0.272 ballistic coefficient is typical for the 55-grain projectile weight and indicates moderate wind resistance—not extreme long-range performance, but entirely adequate for what this round is engineered to do: deliver rounds downrange reliably during practice and qualification-style shooting.