The powerful .44 Magnum round was originally developed for revolvers and then adapted for pistols and rifles.[Pub 1] It is found commonly throughout the wasteland by way of several variants.
.44 Magnum ball
Standard .44 Magnum ammunition is only used by large caliber handguns and high-powered long arms. It has high base damage, and is rare. The .44 Magnum bullets are called "large bullets" in Fallout: Brotherhood of Steel.
.44 caliber FMJ
Full metal jackets give .44 Magnum rounds the ability to pierce armor. The green-branded magazines are common compared to other .44 variants.
.44 caliber JHP
Jacketed hollow points are common, and will double the base damage of the .44 Magnum bullet.
.44 Magnum, hollow point
.44 Magnum rounds are tipped with hollow points, effective against light armor.
.44 Magnum, SWC hand load
The bullets cause extra damage and pierce light armor. Use of the ammunition requires more frequent weapon repair.
.44 special round
The .44 Special bullets are loaded identically to others. They aren't as powerful as Magnum rounds, but weapons that use them require less frequent repair.
.44 Magnum AP
These armor piercing rounds deal 40% less damage but can piece through 80% of the armor built into any of the robots in the Midwest.
- Fallout: The Roleplaying Game Rulebook p.93: "The powerful .44 Magnum round was originally developed for revolvers. Its excellent stopping power makes it well suited for any inhabitant of the wasteland needing a round capable of stopping monsters, human or otherwise. All this is limited mainly by the scarcity of these rounds"