Barnes .243 Caliber Rifle Bullets 90 grain Polymer Tipped Boat Tail 50 Bullets. 243in 6mm 90gr TAC-TX BT was designed and optimized around the 6mm ARC and its velocity range. We offer other .243in 6mm TTSX & TSX bullets that may shoot well in a 6mm ARC but their internal cavities were designed for higher velocity cartridges and will not provide sufficient terminal performance in this cartridge or similar cartridges. The cannelure is correctly positioned so you can crimp into it. In addition to the 6mm ARC the 6mm Creedmoor is also a great application for this bullet. Specifications for Barnes .243 Caliber Rifle Bullets 90 grain Polymer Tipped Boat Tail: Manufacturer: Barnes Bullet Type: Polymer Tipped Boat Tail (PTBT) Bullet Weight: 90 grain Projectile Caliber: .243 Caliber Diameter: 0.243 in Bullet Quantity: 50 Bullet Case Material: Copper Package Contents: Barnes .243 Caliber Rifle Bullets 90 grain Polymer Tipped Boat Tail Barnes 32470: .243 Caliber Rifle Bullets 90 grain Polymer Tipped Boat Tail 50 Bullets