That depends on which 5.56 round you had in mind.
The original M193 cartridge used a 55 grain projectile.
The current M855 and SS109 NATO standard cartridges use a 62 grain projectile.
The M196 tracer (which complimented the M193 ball cartridge) uses a 54 grain projectile.
The M202 cartridge used a 58 grain projectile.
The experimental XM287 and XM288 cartridges used a 68 grain projectile.
The M856 tracer (which compliments the M855/SS109) uses a 64 grain projectile.
The M995 armour piercing cartridge uses a 52 grain projectile.
The Mk. 262 Mod. 0/1 cartridge uses a 77 grain projectile.
556 metres = 55,600 centimetres
556
There are: 556/3 = 185 yards and 1 foot
There are 10 millimetres in one centimetre. Therefore, 556 millimetres is equal to 556/10 = 55.6 centimetres.
556 * 556 = 309,136
1000 mL = 1L so 556 mL = 0.556 L
50
556 days equals to 1 year 7 months which means 19 months are there.
31 556 926
556 only
556 = 55,600%
why you asking me 556-thousands = 556/1000 = 0.556 as a decimal