Winchester Ammunition Super Suppressed, 300 Blackout, 200 Grain, Open Tip, 20 Round Box SUP300BLK Super Suppressed ammunition is optimized for firearms equipped with suppressors. Offering clean and reliable performance, the Super Suppressed line is engineered for noise reduction, decreased barrel/suppressor fouling and recoil mitigation. Consistent performace and exceptional accuracy is backed by generations of Winchester legendary excellence.