What you get:
 
x999 of each ammo type.
 
.22 cal Rounds (18-25 rounds)
9mm Rounds (15-22 rounds)
.45 cal Rounds (15-22 rounds)
.357 HP Rounds (15-20 rounds)
.44 Magnum HP Rounds (15-24 rounds)
12g Shells (15-22 shells)
5.56 mm Rounds (12-18 rounds)
7.62 mm Rounds (10-15 rounds)
.50 AP Rounds (5 rounds)
40mm Grenades (1 grenade)