WINCHESTER SUPER SUPPRESSED 300 AAC BLACKOUT FMJ RIFLE AMMO For those looking to maximize the performance of their suppressors, subsonic ammunition is a must. Winchester Super SuppressedA(R) ammunition offers clean and reliable performance. It is engineered to keep suppressors cleaner by nearly eliminating lead vaporization from the bullet base. The jacket of the open-tip rifle bullets fully encapsulates the bullet base, while handgun bullets use a unique brass disc that encloses the base of the bullet, both features protect the lead core from high temperature exposure that can cause lead fouling. Intended for target and range shooting, Winchester Super SuppressedA(R) ammunition Mfg: Winchester