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No. 9mm Parabellum ammo is about .35 caliber, and the .45 is, well, .45 caliber. The .45 cartridge is too wide to fit in the chamber.
Depends on which 45 and which 44 chambering you are talking about the load
A 44 magnum is just the new and improved version of the 44 special which the special is a 44 caliber. Magnum just means bigger so the 44 magnum is pretty much in between 44 and 45 cal. However, if you mean size, .45 is slightly larger in diamater than .44.
Caliber is .45 GAP (Glock auto pistol)
No, it won't fit. The .45 caliber bullet is 0.45" in diameter; the .30 caliber bullet is .15" smaller. The brass is different size too.
It depends on what you mean by bigger, but the answer to the question you're probably asking is yes. A .45 caliber bullet is .45 of an inch in diameter. A .44 caliber is .44 of an inch, so it's slightly smaller in diameter. However, .44 caliber bullets are many times longer and heavier. A common weight for .45s is 200 or 220 grain, and for .44s it's usually 240 grains.
It depends on the load
No.
No. There was a 45
No one. A standard .45 ACP bullet is about 230 grains. A .45 caliber bullet that only weighed 50 grains would merely be a very thin disk of lead.
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.
The longer case of the .44 Magnum holds more powder, and, even though the .44 is smaller in diameter, it tends to pack a heavier projectile, ranging from 240 to 350 grains, vs. the typical 165 to 235 grain projectiles used by the .45 ACP.