Hornady's Varmint Express Rimfire delivers the pinnacle of rimfire performance. Each cartridge is loaded to ensure optimal pressure, velocity, accuracy and lot-to-lot consistency. The brass is chosen to ensure it meets our high standards for reliable feeding, corrosion resistance, proper hardness, and the ability to withstand maximum chamber pressures. Like the powder, each primer is carefully matched to individual loads, and all are chosen for their ability to quickly, completely and reliably ignite the powder charge.