5.56×45mm NATO

The 5.56×45mm NATO is a rimless bottlenecked intermediate cartridge family developed in the late 1970s in Belgium by FN Herstal. It consists of the SS109, SS110, and SS111 cartridges. Wikipedia
 
Bullet diameter5.70 mm (0.224 in)
Case length44.70 mm (1.760 in)
Case capacity1.85 cm3 (28.5 gr H2O)
Parent case.223 Remington (M193)
Shoulder diameter9.00 mm (0.354 in)
Base diameter9.58 mm (0.377 in)
Rim diameter9.60 mm (0.378 in)

Aguila Ammunition 5.56 X 45MM 62 GRAIN FMJBT / FULL METAL JACKET BOAT TAIL NO. 1E556110

Aguila Ammunition, Rifle, 556NATO, 62 Grain, Full Metal Jacket Boat Tail, 50 Round Box

€24.65

Aguila Ammunition 5.56 X 45 FMJBT / FULL METAL JACKET BOAT TAIL NO. 1E556125

Aguila Ammunition, Rifle, 556 NATO, 55 Grain Full Metal Jacket Boat Tail, 300 Round Box

€145.30 €109.20

SSA by Nosler 5.56 77gr Custom Competition® OTM Ammo (20ct)

SSA by Nosler, 556NATO, 77 Grain, Hollow Point, Boat Tail, 20 Round Box

€20.85