Cowboy (Fallout: New Vegas)

 is a perk in Fallout: New Vegas.

Effects
This perk increases damage dealt with dynamite, lever-action firearms, hatchets, knives, and revolvers by 25%, as well as any unique variants of the weapons.

From GECK, the list of 22 weapons affected by +25% damage of Cowboy perk (PerkCowboyWeapons list), along with their base attack values:

Explosives:
 * Time Bomb
 * Dynamite
 * Long Fuse Dynamite

Melee:
 * Knife (8)
 * Throwing Knife (15)
 * Combat Knife (15)
 * Chance's Knife (22)
 * Hatchet (16)
 * Throwing Hatchet (20)

Pistols:
 * .357 Magnum Revolver (26)
 * Lucky (30)
 * Hunting Revolver (58)
 * Ranger Sequoia (62)
 * .44 Magnum Revolver (36)
 * Mysterious Magnum (42)

Rifles:
 * BB Gun (4)
 * Abilene Kid LE BB Gun (4)
 * Cowboy Repeater (32)
 * La Longue Carbine (35)
 * Trail Carbine (45)
 * Lever-action Shotgun (48)
 * Brush Gun (75)