Big Guns (Fallout 3)

Big Guns is a skill in Fallout 3. It determines combat effectiveness with any weapon categorized as a "Big Gun," such as flamers, miniguns, missile launchers or the Fat Man.

Math

 * $$\text{Initial level}=2+(\text{Endurance}\times2)+\left\lceil\frac{\text{Luck}}{2}\right\rceil$$

Example: A starting Endurance of 5 and Luck of 5.
 * $$2+(5\times2)+\left\lceil\frac{5}{2}\right\rceil=15$$

As this skill increases, so does the accuracy and damage with all of these weapons, both in and out of V.A.T.S. mode.

Ways to increase Big Guns skill

 * Permanent
 * Leveling up (10+INT (+3 with Educated perk))
 * Bobblehead - Big Guns (+10)
 * Bobblehead - Endurance (+2)
 * U.S. Army: 30 Handy Flamethrower Recipes (+1 or +2 with Comprehension)
 * Size Matters (+15 with each rank, max 3 ranks)
 * Tag! (+15)
 * Temporary
 * Buffout (+2-6 depending on Endurance, a perfect Endurance of 10 will see no benefit.)
 * Linden's Outcast power armor (+5)
 * Torcher's mask (+5)
 * Raider blastmaster helmet (+5)
 * Bombshell armor (+10) (The Pitt)
 * Lag-Bolt's combat armor (+10) (Broken Steel)

Affected weapons
Fallout 3 Big Guns skill weapons, 2

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