.44 Magnum (10.9mm)

  The .44 Magnum is also known as .44 Remington magnum, is a bullet originally designed for revolvers, but later also got adopted by carbines and handguns.

  It was designed for a very high energy output without increasing the bullet's diameter too much, its a very high velocity round capable of killing almost any thing and is one of the most powerful hand gun bullets ever created. 

 If a heavy bullet is used this bullet is capable of reaching the velocity of 460 m/s and energy output of nearly 2,078 J which is higher then almost every hand gun bullet ever created, lets just say this bullet can easily bring down a small tree. 

.44 Magnum compared to other bullets,

2nd bullet to the left is .44 Magnum right next to .50 AE (left) and .357 Magnum (Right)

How ever such power comes with a prise of recoil, muzzle flash and sound. This bullet produces such hard recoil that its said to be unfit for people with small built, and if not shot in right posture the recoil could dislocate your wrist bones, it has a blinding muzzle flash and sound of a blast. 
 But if you want to kill a bull, this is the bullet to be used, and if a FMJ version is just it might just rip right through the bull.

.44 Magnum Bullet types