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If you handload for accuracy, an expander mandrel setup is one of those quiet little upgrades that pays off every time you seat a bullet. The Sinclair Generation II Expander Die Body is the foundation of that system. It's a precision stainless steel die that holds a caliber-specific expander mandrel and threads into any standard 7/8"-14 reloading press, covering everything from 17 up through 338 caliber. The die ships without a mandrel, so you pick the one that matches your brass and the neck tension you're after.
The big improvement over older designs is right in the name. The Gen II body completely captures the mandrel inside the die so it can't pull out under heavy use, and an O-ring up in the cap lets the mandrel float just enough to find its own center in the case neck. That self-centering action is what keeps runout low and gives you consistent, repeatable results across a full batch of brass. The 7/8"-14 body also includes the Sinclair Stainless Steel Split Lock Ring, so you can set your depth and keep it locked in.
This is a genuinely versatile tool on the bench. Run a mandrel down new or fired necks to iron out dings and dents, especially the kind of case-mouth damage you get ejecting brass from an AR or other gas gun. It also sets a uniform inside neck diameter for even bullet tension before seating, and it preps necks ahead of neck turning so they sit correctly on the turning mandrel. Wildcatters lean on it too for necking cases up one caliber at a time. A light touch of sizing wax or dry lube on the mandrel makes the stroke smooth, and many loaders wipe the necks before seating.
This standard body is built for mandrels in the 17 to 338 caliber range. If you're working 35 caliber and larger, that's a job for Sinclair's separate large-caliber die body. The die accepts Sinclair expander mandrels, which run about .001" under bullet diameter, and it also plays nicely with mandrels from PMA Tool and 21st Century. Made in the USA.
No, the mandrel is sold separately. The die body is the holder, and you choose a caliber-specific expander mandrel to match your brass. Sinclair mandrels run roughly .001" under bullet diameter, and you can pick the diameter that gives you the neck tension you want.
This standard body accepts mandrels for calibers from 17 up through 338. If you're loading 35 caliber or larger, you'll need Sinclair's separate large-caliber die body instead, since the two aren't interchangeable.
Yes, as long as your press takes standard 7/8"-14 threaded dies, which covers the vast majority of single-stage and turret presses on the market. The body threads right in like any sizing die and uses the included split lock ring to hold your setting.
Running a mandrel down the neck irons out dings and dents and sets a uniform inside neck diameter, which gives you more consistent bullet tension and better seating. It's also used to prep brass for neck turning and to neck up cases for wildcat cartridges. A light lube on the mandrel keeps the stroke smooth.
| UPC | 050806111158 |
|---|---|
| Manufacturer | |
| Caliber/Gauge | 17 Caliber |
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