Winchester WSPM #1-1/2M Small Magnum Pistol Primers 1000/Box

Winchester Small Magnum Pistol Primers deliver consistent ignition for high-pressure cartridges and magnum loads. The WSPM #1-1/2M primers provide reliable performance across temperature extremes and demanding shooting conditions. These primers handle the increased pressures of magnum pistol cartridges while maintaining shot-to-shot consistency.

What Makes This Different

Winchester's magnum pistol primers feature enhanced cup strength and specialized priming compound formulation compared to standard primers. The harder cup construction withstands higher chamber pressures without primer flow or piercing. Advanced chemical composition ensures complete powder ignition even with slow-burning magnum powders, delivering more uniform velocities than standard primers in high-pressure applications.

Key Features

• Enhanced cup strength for magnum cartridge pressures up to 50,000+ PSI
• Specialized priming compound optimized for slow-burning powders
• Consistent ignition across temperature range from -40°F to 140°F
• Compatible with .357 Magnum, .41 Magnum, .44 Magnum, and similar cartridges
• Non-corrosive, non-mercuric composition for barrel longevity
• Precise cup dimensions ensure proper seating in primer pockets
• Bulk packaging of 1000 primers per box for high-volume reloaders

These primers excel in competitive shooting applications where velocity consistency matters most. Law enforcement agencies rely on Winchester magnum primers for duty ammunition requiring maximum reliability. The enhanced ignition characteristics prove essential for hunting loads using heavy bullets and maximum powder charges. Cold weather performance remains consistent when standard primers might fail to achieve complete ignition.

Technical Specs

• Primer Type: Small Magnum Pistol
• Designation: #1-1/2M (WSPM)
• Cup Material: Brass with reinforced construction
• Quantity: 1000 primers per box
• Packaging: 5 boxes per case (5000 total primers)
• Anvil: Three-leg design for consistent strike
• Storage Temperature: -65°F to 200°F
• Shelf Life: 10+ years when stored properly
• Country of Origin: United States

Winchester's century-plus experience in primer manufacturing shows in the WSPM's consistent performance record. Serious reloaders choose these primers when standard options cannot handle magnum pressures reliably. The bulk quantity provides excellent value for competitive shooters and commercial reloaders requiring large primer inventories.