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There is no right answer to this question.
Its like asking: "Which is the fastest race car?" A dragster may be fastest on straight-aways, while Formula-1 or Indy car is fastest on a course that has turns."
With regards to 9mm vs .45 ACP, there are pros & cons to each:
9mm: usually holds 14 or more rounds, less recoil, greater variety of ammo,
45 ACP: better target penetration, more target damage, [heavy recoil, low capacity]
Spending time at the shooting range firing a 9mm and a 45 will help you decide which is best for you. I personally prefer the 45, but mine can only hold 7-8 rounds. They do make larger capacity 45 handguns, but the diameter of the grip is too large for my hands.
You can also consider the .40 SW (~10mm short), which basically falls in between the 9mm (.355 cal) and the .45 ACP (~11.43mm).
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What ammo is cheaper 9mm or 45?
9mm target ammunition is commonly less expensive than .45 ACP.
Whats the size difference of 9mm and .45cal?
9mm= .355 45 ACP = .452
For guns What is more powerful a 45acp 0r a 9mm?
The actual power of any given cartridge is based on speed and weight of the bullet. There are multiple different loads for the 9mm Parabellum, and for the .45 ACP. HOWEVER- in general, the 9mm Parabellum has a higher energy than the .45 ACP. Search Wikipedia for 9mm Parabellum, and for .45 ACP. Scroll down for energy figures on the left. It should be noted that almost all .45 loads have heavier bullets, and the .45 ACP is generally considered to have greater "stopping" power than the 9mm.
Is the Thompson m1a1 chambered for the 9mm round?
No. It is chambered for the .45 ACP cartridge.
What caliber shell does an uzi fire?
.22, 9mm, 45 ACP are among them.
Why is a 45 gap comparable to a 45 acp and a 380 acp is not comparable to a 9mm?
The 45 GAP operates at slightly higher pressure than standard (non +p) 45 ACP ammunition and by this means is able to generate similar velocity and energy to the 45 ACP cartridge. The 380 Auto cartridge is not only smaller than 9mm Luger, it is also far lower pressure. The 380 Auto delivers far less velocity and energy and cannot handle as much bullet mass as the 9mm.
Why does a 45 ACP produce less pressure than a 9mm?
Less powder for its size.
What travels faster a 9mm or 45 caliber bullet?
Assuming you're referring to the 9x19 Parabellum/Luger round, the 9mm travels faster than the .45 ACP.
Can you fit a 45 ACP round in a 9mm magazine?
No. The feed lips are curved to retain cartridges in the magazine until the firearms cycle and the cartridges are pushed forward into the chamber. The feed lips on a 9mm magazine are much too narrow to fit a .45 ACP cartridge.
What is standard sidearm for us army?
It was the .45 ACP until about 20 years ago when it was phased out and replaced by the 9mm.
What bullets are used in the glock pistol?
Glock pistols are made in a variety of calibers. Currently available in .380 ACP, 9mm Luger, .357 Sig, .40 S&W, 10mm Auto, .45 ACP and .45 GAP.
What is a 9mm short?
9mm Short is another term for the .380 ACP cartridge.
