Historical information
Each is a 5.56mm x 45mm NATO round as used by the Australian military c. 1970s and 1980s.
Physical description
Group of three 5.56 mm rimless bottleneck rounds complete with projectile in the case..1) and .2) are identical. .3) has the projectile pushed back into the case. Each case is cylindrical in shape and made of brass. Each projectile is pointed and made of copper coloured metal.