This is .22 Mag Winchester Silvertip 40gr. Defense Jacketed Hollow Point Ammo. This is Winchester's top of the line .22 Mag. 
Winchester Silvertip has been trusted for decades when it matters most. Silvertip Defense ammunition offers the time-proven design with the Power to Defend. The jacketed hollow point design provides maximum stopping power for personal defense scenarios. The profile of the Silvertip bullet achieves devastating energy transfer by splitting into four pieces upon impact, while the bullet base still achieves deep penetration. The powder is tailored for common, short barreled personal defense firearms to deliver the velocity required to initiate segmentation upon impact.
 
Caliber - .22 Winchester Magnum Rimfire
Bullet Weight - 40 Gr. Defense JHP
Package Quantity - 50 rds.