Barnes .400 Caliber Rifle Bullets 190 grain TSX Flat Base 50 Bullets. Thanks to its large open-nose design fluid can immediately enter the hollow cavity allowing the bullet to expand rapidly. Combined with its six-petal design this bullet expands reliably dang near subsonic velocities making it a legitimate 300-yard cartridge. Note on absence on TSX grooves: When fired in the .400 Legend Barnes has found that TSX grooves do not have a significant effect on fouling pressure or accuracy. For this TSX bullet Barnes has intentionally omitted the grooves. Specifications for Barnes .400 Caliber Rifle Bullets 190 grain TSX Flat Base: Manufacturer: Barnes Bullet Type: TSX Flat Base Bullet Weight: 190 grain Projectile Caliber: .400 Caliber Diameter: 0.4 in Bullet Quantity: 50 Bullet Case Material: Copper Package Contents: Barnes .400 Caliber Rifle Bullets 190 grain TSX Flat Base Barnes 32473: .400 Caliber Rifle Bullets 190 grain TSX Flat Base 50 Bullets