Atomic Ammunition Atomic Ammo 5.56x45 500 Rounds 62gr. Hornady Fmj Bulk-pack. 56x45 500 Rounds 62gr. Hornady Fmj Bulk-pack online at OpticsPlanet. This Atomic Ammunition Ammunition features Full Metal Jacket (FMJ) bullets that deliver strong stopping power superior accuracy and reliability. With daily deals on Ammunition and other top-tier rifle ammo from trusted brands like Atomic Ammunition you re sure to find the best round for your next outdoor adventure or training session. Stock up today to save big on ammunition and other top-tier tactical hunting and outdoor gear at OpticsPlanet. Specifications for Atomic Ammunition Atomic Ammo 5.56x45 500 Rounds 62gr. Hornady Fmj Bulk-pack: Manufacturer: Atomic Ammunition Caliber: 5.56x45mm NATO Number of Rounds: 500 Bullet Type: Full Metal Jacket (FMJ) Bullet Weight: 62 grain Length: 14.3 in Package Contents: Atomic Ammunition Atomic Ammo 5.56x45 500 Rounds 62gr. Hornady Fmj Bulk-pack