The 9mm came into popularity because of it's high capacity magazines which hold between 15-20 rounds where a .45 holds between 7-10. the .45 fires a 185-230 grain bullet, the 9mm about half that. The stopping power of the 9mm is minimal compared to the .45. The bullet diameters are .45 inch and .38 inch. The 9mm is less expensive to shoot and recoil is minimal which makes it a good choice for target shooting, the .45 is a little more costly to shoot and has a bit more recoil. It would also depend on what you want it for, to shoot target and such the 9mm will do it for you, for defence I would take the .45 over the 9mm alrhough the 9mm is a fair defence piece. they both have their points, Good luck choosing......
The 9mm Parabellum(9mmLuger) is .355 caliber.
9x19mm, also known as 9mm Luger or 9mm Parabellum.
Caliber (or calibre) is a measurement of the inside diameter of the barrel, and is also used to refer to the particular cartridge fired by a given gun. A .45 caliber gun fires a bullet that is ROUGHLY .45 inches in diameter. A 9mm uses a bullet that is ABOUT 9mm in diameter.
Caliber refers to the diameter of the bullet the gun fires. The caliber of a 9mm is 9 millimeters. That is about .356 inches.
The velocity depends on the precise firearm, not the calibre.
The cast of Calibre 45 - 2006 includes: Molcas as himself
45 Calibre Echo - 1932 was released on: USA: 5 February 1932
The cast of Calibre 45 - 1924 includes: Cathleen Calhoun Franklyn Farnum
refers to bore size
45 Calibre Echo - 1932 is rated/received certificates of: USA:Passed (National Board of Review)
45 Calibre War - 1929 is rated/received certificates of: USA:Passed (National Board of Review)
9mm target ammunition is commonly less expensive than .45 ACP.