The Redding Competition Bushing Neck 3-Die Set for .300 Winchester Magnum (Redding part no. 58153) brings the same competition-grade neck sizing control to magnum-length brass. Redding built this set so the case sits fully supported and aligned in a tightly chambered sliding sleeve before sizing starts, and the resizing bushing self-centers on the neck for concentricity tighter than a standard full-length die delivers. A firing-pin-style support keeps the decapping rod precisely aligned through the entire stroke, and a micrometer adjustment gives exact control over how much of the neck gets sized on each case. The set includes a Competition Bushing Neck Sizing Die, a Body Die, and a Competition Seating Die, built for handloaders running prepped magnum cases without relying on a sizing button.

Key Specifications

• Includes a three-die set: Competition Bushing Neck Sizing Die, Body Die, and Competition Seating Die.
• The case is fully supported in a tightly chambered sliding sleeve before sizing begins.
• The sizing bushing self-centers on the neck of magnum-length brass for improved concentricity.
• The decapping rod stays precisely aligned throughout the stroke, supported like a firing pin.
• A micrometer adjustment controls exactly how much of the neck length gets sized.
• Built for magnum cartridge cases, sized specifically for .300 Winchester Magnum brass.
• Ships without a bushing installed, so the correct-diameter bushing is ordered separately.

Frequently Asked Questions

What three dies come in this set? A Competition Bushing Neck Sizing Die, a Body Die, and a Competition Seating Die.

Is this set sized for magnum brass? Yes, it’s cut specifically for .300 Winchester Magnum cases.

Does it come with a bushing? No, order the correct bushing diameter separately.

Buy the Redding Competition Bushing Neck 3-Die Set, .300 Winchester Magnum

Long-action magnum brass deserves the same concentricity control competition shooters demand from standard cartridges, and this set delivers it. Order from our Redding lineup in our reloading dies selection, and our Lubbock, Texas team can help you pick the right neck bushing.