This is .257 WBY Mag. Hornady Custom 110gr. InterBond Polymer Tip Ammo. These bullets deliver enough energy to successfully bring down deer, antelope and sheep. Each cartridge is loaded to ensure optimal pressure, velocity and consistency, from lot to lot. This ammunition is new production, non-corrosive, boxer primed, reloadable brass cases. Velocity 3330fps. This ammo comes packed in 20 round boxes.