yup, it's .223 caliber --one one thousandth of an inch bigger than a .22.
You'd have to have a micrometer to tell the difference.
rofl
The 5.56 NATO is essentially a .22 Caliber Projectile.
It is measured in metric terms like this: 5.56 Millimeters X 45 Millimeters.
The projectile is 5.56 mm in diameter and the casing is 45 mm tall.
It also holds around 30 grains of powder and the projectile weighs either 55 grains or (in the newer ones) 60 grains.
In the old days, they often measured bullets like the 30-30. Because it was .30 Inches in diameter and held 30 grains of powder. There was also the old 30-40, the 44-40 and 22-20 (a varmint round).
the .223 is a civilian cartridge but can be interchanged with the 5.56 It's not as hot as the Military round.
The 30-06 was a .30 caliber projectile and was developed in 1906, hence its name. It measures 7.62 X 63
Anything else?
Yeah sure. Can you show me how to insert a .223 cartridge in my .22 rifle? Or better yet how about showing me how to shoot a .22 round sr or lr in my mini-14.
ROFL