Caliber refers to the diameter of a bullet (bullet is the part of a cartridge that is fired out of the gun). A .223 caliber bullet is .223 inches across. It is normally used as a rifle cartridge. a .45 caliber bullet is more than twice as wide as a .223, and is usually used in pistols. The .223 is lighter- it weighs about 1/4 of a .45 bullet, and they are different shapes- .223 is usually pointed, the .45 is rounded.
Any firearm chambered for .223 or 5.56mm
yes, a bullet can roll. Only on its side (obviously)
Only .223 ammo. There are different bullet weights.
.223 inches in diameter, typically 45 to 55 grains for the .223 Remington, and 80 grains for the .223 Wylde.
No. Not even close.
.223
.223 inches.
Can't really be answered without knowing the type of weapon, rate of twist, barrel length, and sights.
@ 3 miles
"Boattail" refers to a bullet that the rear is not flat, but has a taper similar to the stern of a boat. Such bullets have a better "ballistic coefficient" than bullets with square backs- less drag due to better streamlining. 223 refers to the bullet diameter- or .223 inches.
The .22 Long Rifle is a rimfire, whereas the .223 Remington is a centerfire cartridge. The .223 uses a longer 'spitzer' projectile vs. the rounded projectile of the .22 LR. The .223 tends to be a heavier projectile, and has a much higher velocity than the .22 LR.