Winchester Ammo S22MPDX1 Defender22 WMR 45 gr Jacketed Hollow Point (JHP) 50 Bx/20 Cs

Winchester Defender .22 WMR ammunition delivers a proven defensive round in a rimfire platform. Loaded with a 45-grain jacketed hollow point (JHP) bullet, this cartridge is engineered for reliable expansion and penetration when it matters. Each box contains 50 rounds, making it practical for both practice and storage.

The .22 WMR (Winchester Magnum Rimfire) is a versatile cartridge popular among shooters who want more power than standard .22 LR, whether for small-game hunting, varmint control, or personal defense in a compact firearm. Winchester's Defender line brings their ammunition expertise to the rimfire market with consistent quality and predictable performance you can count on.

Jacketed hollow point construction is designed to provide controlled expansion on impact, a critical feature for any defensive application. Winchester's manufacturing standards ensure round-to-round consistency, so every shot behaves like the last—important whether you're zeroing a new rifle or depending on your firearm in the field.

Key Features

• 45-grain jacketed hollow point (JHP) bullet design for expansion and penetration
• .22 WMR (Winchester Magnum Rimfire) caliber—more power than standard .22 LR
• 50 rounds per box; 20 boxes per case for convenient stocking
• Winchester-engineered for reliable, consistent performance

Specifications

Frequently Asked Questions

What is .22 WMR ammunition used for?

.22 WMR (Winchester Magnum Rimfire) is a popular rimfire cartridge for small-game hunting, varmint control, target shooting, and personal defense in compact firearms. It offers significantly more power than standard .22 LR while remaining affordable to shoot.

Will Winchester Defender .22 WMR work in my rimfire rifle or handgun?

This ammunition is chambered in .22 WMR, so it will work in any rifle or handgun marked for that caliber. Always verify your firearm's chamber marking before loading any ammunition.

What does jacketed hollow point (JHP) mean?

A jacketed hollow point bullet has a metal jacket surrounding a lead core with a hollowed tip. On impact, the hollow cavity promotes controlled expansion of the bullet, which is designed to improve stopping performance in defensive scenarios while limiting over-penetration.

How much ammunition is in a case?

Each case contains 20 boxes, with 50 rounds per box, for a total of 1,000 rounds per case.