That depends on the caliber of the round of ammunition.
A ".45 caliber" can be a gun that uses .45 caliber ammunition or it can be a round of that ammunition. There are several specific calibers of small arms ammunition that are all generally called ".45 caliber." They have bullets that are roughly .454 of an inch or 454/1000 fractionally. A famous .45 caliber is the .45 Long Colt, invented in the 1870s and still popular today. It is used in revolvers. Another caliber that is the same diameter but a lot shorter in length is the .45 ACP or .45 automatic Colt pistol. It was made for use in the U.S. military's Model 1911 handgun, and it is still a popular caliber today in that gun and in other handguns. There are some rifles and carbines that use .45 caliber ammo, too.
6.8mm / .270
Speer Bullets sell ammunition for rifles and handguns. Bullets are available for different situations such as self-defense and hunting. They also sell plastic bullets, lead round balls and shot capsules.
The m1a1 carbine is manufactered by Inland which is a division of General Motors. It is equipped with a 15-round magazine and takes .30 caliber ammunition.
7.62x39 ammunition. Be sure to check the barrel for caliber. Some weapons called "AK" Are chambered for different calibers. .223/ 5.56.....5.45X39 ETC.
Comparatively, the 9x19mm round is quite small compared to ammunition other compact pistols use - such as the 7.65x21mm Parabellum used by some German made handguns.
They're both measurements of the diameter of the round (or the barrel). Caliber is a measurement in inches, and millimeters are millimeters. For instance, a .30 caliber bullet is 30 hundredths of an inch, or 7.62 millimeters in diameter.
Yes. For every caliber of ammunition, there is a hollow point round that goes with it, except for .50 caliber machine gun and sniper rounds.
Non-American nations typically use the metric system to denote the size of their ammunition, as does the US military. The 7.62mm round is equivalent to the .30 caliber round, which is 30-hundredths of an inch.
Caliber is a measurement of the width of a bullet using the Imperial system. For example a .50 caliber round is 1/2 and inch wide, a .45 ACP round is .45 inches wide. The metric system is used in the same way, a 7.62 round is 7.62mm wide. Keep in mind these measurements are based on the physical bullet and not the casing as well. Rifle and assault rifle rounds typically have wider casings that bullets.
.32 caliber is not enough infromation. Ammunition marked "7.65 Browning", ".32 auto" and ".32 ACP" for practical purposes, are all the same. Do NOT try to use ammo such as ".32 magnum" or ".32 long" as it would be a different round.