Atomic Rifle Subsonic 6.5mm Creedmoor 129 Grain Hollow Point Boat Tail Steel Cased Centerfire Rifle Ammo 20 Rounds. 5 Creedmoor 129 gr Hollow Point Boat-Tail (HPBT) 2 - Atomic Ammunitions 6.5 Creedmoor Subsonic ammunition is unlike any high powered rifle ammunition. It is quieter than most .22 Long Rifle ammo has virtually no felt recoil produces the same energy and power as many .40 S&W police service rounds and delivers excellent accuracy past 100 yards from rifles with barrel twist rates of 1 in 11 or faster. Specifications for Atomic Rifle Subsonic 6.5mm Creedmoor 129 Grain Hollow Point Boat Tail Steel Cased Centerfire Rifle Ammunition: Manufacturer: Atomic Ammunition Caliber: 6.5mm Creedmoor Number of Rounds: 20 Bullet Type: Boat Tail Hollow Point (BTHP) Bullet Weight: 129 grain Cartridge Case Material: Steel Muzzle Velocity: 1050 ft/s Atomic 00482 Rifle Subsonic 6.5 Creedmoor 129 Gr Hollow Point Boat-Tail (HPBT)