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4.4x55mm AMJ Custom


4.4x55mm AMJ Custom is an extreme long range wildcat cartridge constructed using a 12.7x55mm casing necked down to .17 HMR/4.4mm projectiles. It is capable of reaching extreme velocities but due to the limited mass of the projectiles it does not offer enormous amounts of damage down range.


Note: 343.2 m/s is the subsonic barrier - anything below that is considered subsonic. Subsonic ammunition removes the bullet crack down range making the round better suited to stealth.

Ammunition Type Damage Bullet Velocity (m/s) Barrier Penetration Armor Piercing
15gr FMJ 4.9 1982 0.9 5
17gr FMJ 5.5 1875 1.9 5
20gr FMJ 5.7 1799 3.9 5


Note: Barrier penetration represents the rounds ability to go through walls and barriers. Armor piercing represents the rounds ability to penetrate body armor plates.