<p>Winchester® developed Super Suppressed™ Rimfire Ammo specifically to function reliably in rimfire rifles or pistols equipped with sound suppressors. The 45-grain, black copper-plated, round-nose bullet shoots accurately, feeds reliably, and leaves minimum fouling in suppressor baffles, barrel, feed ramp, and mag lip, making it dependable ammunition for serious use. Subsonic velocities reduce noise as well as muzzle flash. Winchester Super Suppressed Rimfire Ammo has also been tested extensively to cycle semi-auto firearms. </p> <ul> <li>Functions reliably with sound suppressors</li> <li>45-grain, black copper-plated bullet</li> <li>Leaves minimum fouling</li> <li>Reduced muzzle flash</li> <li>Subsonic velocities</li> </ul>