HSM Ammunition Starline Rifle Brass Unprimed Cases 260 Rem Caliber 50 Per Bag. 260 Remington is another wildcat turned commercial cartridge. Utilizing a 6.5mm (.264") diameter bullet the .260 has a lot less recoil than its .308 parent case but shoots much flatter. This has made it very popular in many shooting sports and makes it an excellent choice for hunting in much of the U.S. Specifications for Starline Brass Unprimed Cases Rifle 260 Rem: Manufacturer: HSM Ammunition Gun Type: Rifle Caliber: .260 Remington Primed: No Quantity: 50 Fabric/Material: Brass Package Contents: Starline Brass Unprimed Cases Rifle 260 Rem