Experimental MIRV

The Experimental MIRV is a Fat Man Launcher that can be found in the bomb shelter area in the National Guard Depot next to 5 Mini Nukes on a table near a Glowing One, near the remains of the skeletons of the Keller Family. When this weapon is fired, a random shotgun spread seems to be the path they take, usually 6 or 7 near each-other and one off in the distance before impact, if aimed correctly, this weapon can kill anything in one hit, even the Super Mutant Behemoths. You must have obtained all five of the Keller Family Transcript's before you can gain entrance to this part of the room. It will only fire eight Mini Nukes at once, no more no less.

Be sure to never use this weapon at close range or near NPC's wished to be kept alive.

Bugs
If you have fewer than 8 rounds, you can still enter VATS to attack. However, it will just 'click' 8 times over the course of 20 seconds, then exit VATS with no action point loss. *Note* This can effectively be used for a short-lived god mode, useful if stood next to a pile of burning cars.

Cheat
For the PC version, pressing Console and entering "TGM" will toggle god mode, which also grants unlimited ammo (no need to reload). You can get 5-6 shots off before the first ones start detonating. Use your imagination. Also note, if you do this, your framerate will suffer more damage than the random bit of wasteland you're blowing to pieces.

Ever wanted to go into space? Well, now you can with the brand new MIRV!! Simply perch on a ledge and fire the weapon at the ground just below the ledge, or, should ledges be in short supply, fire straight into the air and wait a few seconds. When the bombs go off, your body will break orbit! The bomb in Megaton makes an excellent perch!(Warning, in 360 version, NPC's remain hostile on reloads after use of MIRV in towns.)