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.264 USA


.264 USA is a precision cartridge originally designed for the US Army Marksmanship Unit, it is larger than 5.56x45 and slightly smaller than 7.62x51 and fits in AR-15 Actions and magazines allowing for lighter rifles and magazines. Since its original conception it has been turned into a combat cartridge with various loadings for different jobs, additionally following recent trends it utilises a polymer case which allows for a lighter combat loadout than comparible cartridges such as 6.5 Creedmoor.

The round performs similarly to 6.5 Creedmoor but in a smaller package and is considered a 'magnumised' 6.5 Grendel.


Steel-core Enhanced Performance Round similar to M855A1/M80A1. Multipurpose round with all round performance.

Has red tracer variant.


SOST Barrier-Blind loading, offering both hollowpoint capabilities as well as soft barrier penetration such as timber, sheet metal and buildings. Poor AP performance despite decent barrier penetration capabilities.

Has red tracer variant.


Reduced-Ricochet-Limited-Penetration Frangible designed for urban operations where collateral must be minimised. Fragments heavily within soft tissue offering decent damage. Intentionally poor penetration capabilities due to the frangible nature of the projectile.


Open-Tip-Match loading optimized for long range combat.

Has red tracer variant.


Designed for stealth operations. It does not produce a supersonic crack and is quieter to enemies making you harder to spot when shooting. 

Has green tracer variant, green tracer chosen to mimic Russian barium salt tracers to induce confusion in hostile forces.

Advanced AP

Tungsten-core Advanced Armor-Piercing load designed for defeating modern Russian body armor threats.
Has red tracer variant.


High Velocity Incendiary Tracer-Armor Piercing Reactive is a semi-explosive incendiary load designed for light anti-vehicle duties. Uses a white incendiary tracer.


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.

Note: these stats are only accurate to TAU-44s modset and vary wildly from default RHS stats. 

Ammunition Type Damage Bullet Velocity (m/s) Barrier Penetration Armor Piercing
EPR 10 876 2.6 17
SOST 13.2 842 4.67 8
RRLP 13 907 0.5 4
OTM 11.7 988 1.6 5
Subsonic 11 300 1.4 6
ADVAP 9.4 700 5.6 125
HVIT-APRE 7.4 + 0.08 Explosive Damage @ 1m 1488 11.6 425

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