Special Ammunition/Upgrades by book
Black Crusade Core Rulebook
Stalker Rounds (Rare)

Deathwatch Core Rulebook
Dragonfire Rounds (Extremely Rare)
Implosion Rounds (Extremely Rare)
Kraken Rounds (Very Rare)
Hellfire Rounds (N/A, they do not exist yet)
Witchbolts (Very Rare)

Deathwatch Rites of Battle
Breaching Rounds (Rare) (Note: Shotgun Ammo Only)
Ignis Rounds (Rare) (Note: Autogun/Auto Pistol/Shotgun ammo)
Penetrator Rounds (Rare) (Note: Autogun/Auto Pistol/Shotgun ammo)
Shredder Rounds (Rare) (Note: Shotgun Ammo Only)
Slug Rounds (Rare) (Note: Shotgun Ammo Only)

Deathwatch Outer Reach
Singularity Rounds (Near Unique) Pg. 37

Dark Heresy Ascension
Psybolts (Extremely Rare)

Rogue Trader Core
Tempest Shells (Near Unique/Extremely Rare when able to receive Dark Mechanicus support aka Chargen Extremely Rare)

Rogue Trader Into the Storm
Acid Shells (Very Rare)
Airtorch Canister (Very Rare)
Microburst Flask (Very Rare)
Organgrinder Rounds (Extremely Rare)
Snare Shells (Rare)
Toxic Shot (Scarce)
Tracer Shells (Average)
Void Rounds (Rare)

Only War
Inferno Shell (Rare)