The caliber of a firearm projectile is measured in thousandths of an inch. A .22 would be a actually be .223 of an inch for .22 rim fire, or .224 of an inch for such as a .223 Remington. A .9mm or a .380 Auto would be .355 of an inch. A .38 or .357 Magnum would measure .375 of an inch. A .40 S&W or a 10mm auto would measure .401 of an inch. Generally the larger the number the larger the caliber.
A 5.56mm is the same thing as a .225 caliber. If you do the math, a 30 caliber is MUCH bigger!
No
Yes. Significantly.
40
Yes, a 45 caliber bullet is bigger than a 40 caliber bullet. A .45 is0.45 inches wide in diameter and a .40 is 0.4 inches in diameter.
No. The AK-47 fires the 7.62x39mm round, which is of the .30 caliber, smaller than the .45 caliber.
Bigger hole lets out more blood
the 40 cal is a little bigger then the 357
They are both the same size. .177
5.62 is bigger
Depends on the caliber being shot. Small caliber, little kick back. Larger caliber bigger kick back...
For use in WW1. A bigger caliber was needed for close combat fighting!