Federal AutoMatch .22 LR 40 gr SLD Rimfire Ammunition - 325/box is high quality and made with plinking in mind. They produce high consistency and group in smaller sizes. They are reliable and can cycle through your semi-automatic. The rounds are brass-cased, non-reloadable, rimfire primed, and noncorrosive. These rounds provide the highest level of performance and accuracy. The rounds are built using the best in lube technologies and bullet strategies. They deliver unbelievable performance, which is a credit to Federal's stringent quality control.