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When you're deep into a reloading session and a decapping pin bends or an expander rod gives out, having a factory replacement on hand keeps things moving. This RCBS Expander/Decapping Assembly is the same unit RCBS builds into its sizing dies, so it drops in and works exactly the way the original did. It handles two jobs at once inside a bottleneck sizing die: pushing the spent primer out through the flash hole and running the expander ball back through the case neck to bring it to the right inside diameter.
Each unit is made up of the expander rod, expander ball, and a decapping pin, and the whole thing is precision machined to hold concentricity through the neck. That matters more than folks expect. A rod that pulls the neck off center is where a lot of runout starts, and clean concentricity here means straighter necks and better bullet seating down the line. It threads into the die with a bit of pin sticking out, then locks down centered once you've run a lubed case up into the die.
The assembly comes in a range of sizes to cover most of the popular cartridge calibers, so you'll want to match the unit to the case you're loading. RCBS also offers tapered versions for cartridges like the .35 Whelen, so double check your caliber before ordering. If you're not sure which one fits your die, RCBS keeps a lookup chart that pairs cartridges to the correct decap unit and pin.
Reloaders who run a lot of military brass tend to keep a spare or two around, since crimped primers and the occasional mixed case are hard on pins and rods. Backed by a limited lifetime warranty and built to the same standard RCBS ships from the factory, this is a cheap insurance policy against a stalled loading bench.
It handles two steps of case prep inside your sizing die at once. The decapping pin pushes the spent primer out through the flash hole, while the expander ball runs back through the case neck to set the correct inside diameter. It's built for bottleneck rifle and pistol cases sized in RCBS dies.
It's a factory replacement built to the same spec RCBS ships from the factory, so it fits RCBS sizing dies for the matching caliber. Just make sure the caliber and style match your setup, since some cartridges like the .35 Whelen use a tapered version. RCBS keeps a lookup chart that pairs your cartridge to the right unit and pin.
Decapping pins and rods take a beating, especially when you run military or mixed brass with crimped primers. Bending or breaking one mid session can bring your loading to a halt, so keeping a spare on the bench saves the day. Reloaders who work through a lot of brass often stock more than one.
It's precision machined to hold concentricity as the expander pulls through the neck, which helps keep necks straight. Setup matters too, since the neck of the die should still be holding the case when the expander enters it. Get the installation centered and locked down correctly and you'll keep runout to a minimum.
| UPC | 076683098146 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 9814 |
| Shipping Weight | 0.0875 |
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