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.277 Lone Star Magnum


.277 Lonestar Magnum is a round designed along side the TX-277 Designed Marksman Rifle. The round along with the rifle was designed as a long range precision rifle for hunting medium to large sized game at ranges in excess of 1km with a single hit. The capabilities of the cartridge and the weapon sparked interest from members of the Commonwealth Joint Task Force and a custom request for select fire variants was submitted to Lone Star Armory.

298gr Solid Brass

298 grain Solid Brass ammunition is hunting cartridge. It does not feature a jacket and was designed to be more environmentally friendly than typical lead projectiles.

152gr MTAC

152gr MTAC (Match/Tactical) is a high velocity long range precision match or tactical use ammunition. It is less suited to hunting but performs well against armor for tactical usage.

272gr MTAC

272gr MTAC (Match/Tactical) is a high velocity long range precision match or tactical use ammunition. The heavier variant of the MTAC is well suited to hunting as well as tactical usage making it a highly versatile round.

250gr RMA

RMA stands for Rocky Mountain Aluminium ammunition. Rocky Mountain is a longrange precision ammunition producer, Lone Star in conjunction with the Commonwealth Joint Task Force contracted RM to produce an aluminium based LR Precision round specifically designed for counter-sniping purposes.

307gr Tungsten AP

Designed and manufactured by Norma Ammunition specifically for the Commonwealth Joint Task Force, the 307gr Tungsten AP round is designed to penetrate most modern body armor's at ranges exceeding 600 meters with ease.

312gr Subsonics

Heavy 312gr Slug with poor ballistics.


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
298gr Solid Brass 17.95 708 4 8
152gr MTAC 16.8 990 6 7
272gr MTAC 17.4 897 4.66 8
250gr RMA 17 993 3.2 8
307gr Tungsten AP 18 750 10 145
312gr Subsonics 19.25 150 1 3

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