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If you handload for accuracy, you already know neck tension is one of those details that separates good groups from great ones. The L.E. Wilson Neck Sizer Die Bushing in .290 (part number B-290) is a hardened steel insert that drops into a Wilson neck sizing die or a Wilson bushing-type full length sizing die to size the outside of your case neck to a precise .290 inches. Swap bushings and you change how tightly the neck grips the bullet, no guesswork and no expander ball pulling your necks out of round.
Using an interchangeable bushing instead of a fixed-diameter die or an expander ball tends to improve neck concentricity and stretches brass life, since the neck isn't getting worked, stretched, and dragged back into shape on every pass. That's a big deal if you're chasing single-digit standard deviations or just trying to get more firings out of good brass. Wilson makes bushings in just about every practical size in .001-inch increments, so you can keep correct tension across different brass lots and bullet combos.
There are two easy ways to land on the correct bushing. Measure the neck diameter of a loaded round where the bullet sits, then subtract .002 to .003 inches for your tension. The other route is to measure your neck wall thickness, multiply by two, add the bullet diameter, then subtract that same .002 to .003. Either method gets you to a number, and you grab the bushing closest to it. A worth-knowing detail with Wilson bushings: the marked size refers to the middle of the bushing, which is reamed with a slight taper, so flipping the bushing so the markings face the case gives you a touch tighter sizing.
This one is machined from steel and made in the U.S.A., so it holds its dimension through a lot of sizing cycles. It's sold as a single bushing, which is exactly how most handloaders build out a set over time, picking up the sizes that match the cartridges on their bench.
It fits the L.E. Wilson Neck Sizing Die and the Wilson Bushing-Type Full Length Sizing Die. The bushing is an interchangeable insert that drops into the die body, which is sold separately. You can also keep multiple bushings on hand and swap them to change neck tension.
Measure the neck diameter of a loaded round where the bullet sits and subtract .002 to .003 inches for tension, then pick the bushing closest to that number. You can also measure neck wall thickness, multiply by two, add bullet diameter, and subtract .002 to .003. If your math lands around .290, this is your bushing.
A bushing lets you size only the outside of the neck to an exact diameter without an expander ball dragging back through the neck. That improves neck concentricity and tends to extend brass life since the neck isn't being overworked every cycle. For precision handloaders, it's a straightforward way to tune and repeat bullet grip.
Yes, the number is the diameter the bushing sizes your case neck to, in this case .290 inch, following Wilson's thousandths-of-an-inch naming. The marked size refers to the middle of the bushing, which has a slight taper. Flipping the bushing so the markings face the case will give you a touch tighter sizing if you want it.
| UPC | 815145024800 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | B-290 |
| Shipping Weight | 0.02 |
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