Between 830 and 1300 feet per second, depending on the load and the barrel length.
The .45 caliber bullet is not used in a sniper rifle.
Depends on the load
The L1A1 SLR used by the British military is in caliber 7.62 NATO, and has a muzzle velocity of about 2800 fps.
Depends on which .45- 45 Colt, 45 ACP, 45 Magnum, 45-70, and which bullet, and what it is fired from. If you mean the .45 ACP fired by a 1911A1 pistol, velocity varies from 830 FPS up to about 1020 fps. Slow, fat, but gets the job done.
The most basic answer is, a 9mm has a smaller diameter. Other differences, (in most cases) less muzzle energy, smaller and lighter bullet, higher velocity.
you will have to define if you mean commercial or wildcat.
800-1000 fps
According to Hodgdon, it varies from about 2850 fps to about 3600 fps.
The .223 Remington rifle cartridge has a muzzle velocity of approximately 3600 feet per second.
It can vary from 900-1300 FPS depending on the weight and the firearm. Generally a smaller slug can have a greater velocity and a greater energy.
muzzle velocity is the velocity of bullet and recoil velocity is the velocity of gun.
Can't be answered without knowing the projectile weight and muzzle velocity