Description
If you're loading for the .284 Winchester, full length sizing is the way to keep your brass running smooth from chamber to chamber. This Hornady Custom Grade New Dimension die resizes the entire case body and neck back to SAAMI spec, which means fired brass drops right back into your rifle without a fight. It's a single sizing die, so you'll pair it with a seating die to build complete rounds, but for the resizing half of the job it does everything you need.
Hornady builds these from select steel that's heat-treated for the long haul, and they back every one with a guarantee against breaking or wearing out under normal use. The internal profile is machined and polished to a smooth finish, so cases glide through without sticking or dragging. That's the kind of detail you notice after a few hundred rounds, when sizing still feels effortless.
What the Zip Spindle Does on This 284 Win Die
The decap spindle sits in a lightly threaded collet Hornady calls the Zip Spindle. You can make fine adjustments by turning it, or zip it up and down quickly for bigger changes, and it locks tight so it won't drift or slip mid-session. The headed steel decap pin is tough enough to punch out crimped primers without bending, which is handy if you ever work with mixed or military-style brass in this family of cartridges.
Elliptical Expander and the Sure-Loc Ring
Instead of a traditional ball expander, this die uses Hornady's long, smooth, threaded elliptical expander. It reduces case neck stretch and friction on the pull-through, and because it's threaded it won't pull loose. You can even neck brass up to the next caliber without a separate expander die. It ships with a Sure-Loc lock ring featuring wrench flats, so you set your depth once and the ring clamps around the die body to hold it there. Everything comes tucked in Hornady's custom storage box.
Key Specifications
- Manufacturer: Hornady
- Manufacturer Part Number: 046303
- UPC: 090255463033
- Cartridge: .284 Winchester
- Die Type: Full Length Sizing Die
- Series: Custom Grade New Dimension
- Thread: 7/8"-14 standard
- Spindle: Zip Spindle with threaded collet
- Expander: Elliptical, threaded
- Decap Pin: Headed steel
- Lock Ring: Sure-Loc with wrench flats
- Warranty: No-Risk Lifetime Guarantee
What’s Included
- Hornady 284 Winchester Full Length Sizing Die
- Sure-Loc lock ring (installed)
- Custom plastic storage box
Frequently Asked Questions
Is this 284 Winchester die a full die set or just the sizing die?
This is a single full length sizing die, not a complete set. It handles the resizing and depriming step, so you'll need a separate seating die to load finished rounds. If you already have a seater or buy dies individually, this covers the sizing half of the job.
Will this die work in my standard reloading press?
Yes. It uses the standard 7/8"-14 thread, which fits single stage and progressive presses that accept common dies. You'll just want the correct shell holder for the .284 Winchester case head, since that isn't included with the die.
What is the Zip Spindle and why does it matter?
The Zip Spindle holds the decap rod in a lightly threaded collet so it stays centered and locked in the die. You can turn it for fine adjustments or slide it quickly for bigger moves, and it won't slip while you're sizing. It also makes centering the decap pin and expander simple to dial in.
Does this die crimp or seat bullets?
No, it only resizes the case and knocks out the spent primer. Bullet seating and any crimp are handled by a separate seating die. This die's job is restoring fired brass back to factory dimensions for reliable chambering.




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