.44 Magnum revolver (Fallout 2)

The .44 Magnum Revolver is an iconic handgun used by Clint Eastwood in the Dirty Harry movies. It appears as a a small gun in Fallout 2 and Fallout 3. In Fallout 2, can be upgraded to the .44 Magnum (Speed Load). This weapon returns in Fallout 3, along with a scoped version.

In-game description
Being that this is the most powerful handgun in the world, and can blow your head clean-off, you've got to ask yourself one question. Do you feel lucky? Well, do ya punk?

Location
Flick in the Den sells this weapon, as does Happy Harry in Vault City.

Fallout 3
The .44 Magnum Revolver returns in Fallout 3 as the Scoped .44 Magnum.

The normal .44 Magnum is only obtainable through console commands, and it is used by the Mysterious Stranger.