20rds - 357 Mag Winchester PDX1 Defender 125gr. Bonded JHP Ammo

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Winchester Ammunition 125 Grain Jacketed Hollow-Point (JHP) Ammo Details

Winchester has been one of the most recognized and respected names in ammunition since 1866. Today, WInchester continues to produce innovative products for the modern shooter. Their PDX1 Defender line is engineered for personal protection and features some of the most advanced threat-stopping technology in the industry.



PDX1 ammunition features high-performance jacketed hollow points. Each projectile has a unique notched nose design that separates into razor-sharp petals on impact. Expanding up to 1 ½ times the original bullet diameter, PDX1 projectiles carve a massive wound channel. Also, the copper jacket is welded to the lead core through a proprietary bonding process. The result is excellent weight retention for deep penetration and hard-hitting energy transfer.



Leaving the muzzle at a velocity of 1325 feet per second, each 125 grain bullet produces 487 foot pounds of muzzle energy. These loads perform well on demanding FBI test protocols, delivering incredible barrier penetration and terminal performance, making them ideal for real-world self-defense situations.



Featuring boxer primers and nickel-plated brass casings, these loads deliver smooth function while ensuring easy low-light chamber checks. Each package contains 20 rounds of factory fresh Winchester PDX1 Defender .357 Magnum ammunition.

  • Ammo Caliber
    357 Magnum
  • Manufacturer SKU
    S357MPDB
  • Primer Type
  • Muzzle Velocity
    1325
  • Muzzle Energy
  • UPC Barcode
    020892218864
  • Cost Per Round
    $1.25/ppr

Gel test Results

As you hunt for the best self-defense 357 Magnum ammo, we thought you might enjoy seeing the results of some testing we recently conducted with calibrated Clear Ballistics gelatin.

We shot five of these Winchester Ammunition rounds through a four-layer cloth barrier using a S&W 640. The results are detailed in the video you see above as well as the photographs. Through the charts, you should get a great idea how this Winchester Ammunition ammo stacked up relative to other 357 Magnum ammo products available to American shooters.

To get a better sense of our tests, be sure to check out all the protocols we followed when conducting our tests to determine the best self-defense ammo.

Unfired versus Fired Round Comparison

Image detailing before and after firing 20rds - 357 Mag Winchester PDX1 Defender 125gr. Bonded JHP Ammo Image detailing before and after firing 20rds - 357 Mag Winchester PDX1 Defender 125gr. Bonded JHP Ammo

How do the results for this Winchester Ammunition 357 Magnum compare to other Hollow Point?

20rds - 357 Mag Winchester PDX1 Defender 125gr. Bonded JHP Ammo Gel Test Results

  Median
Bullet Depth (in.) 12.3 13.1 14.1 14.3 19.8
Expanded Diameter (in.) 0.49 0.66 0.67 0.68 0.68
Bullet Weight after shot (gr.) 121.6 123.9 124.8 124.9 124.9
Bullet Velocity (fps) 1080 1093 1095 1116 1126

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