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The L.E. Wilson Steel Neck Sizer Die Bushing sized at .248 inches is the interchangeable insert that drops into a Wilson neck die or Wilson bushing-type full-length sizing die and sizes the outside of your case neck to a precise diameter. That control over neck tension is the whole point of running a bushing setup, letting you grip the bullet with just the right amount of pressure instead of settling for whatever a fixed-neck die hands you. The die body itself is sold separately, so grab this bushing to match the brass and bullet combo you're loading.
There are a couple of ways to land on the correct size. The quick method is to measure a loaded round at the neck where the bullet sits, then subtract .002 to .003 of an inch. For a more dialed-in number, measure your case neck wall thickness, multiply it by two, add your bullet diameter, then subtract that same .002 to .003 for tension. Keep in mind each brand of brass runs a different neck wall thickness, so a bushing that's perfect for one lot may read differently on another. Plenty of reloaders keep a few sizes on hand to fine-tune.
Running a bushing instead of a conventional expander ball keeps your necks more concentric and stretches brass life, since you're not working the neck out and back on every pass. These are bare steel, precision ground to hold their dimension through years of use, and they interchange freely across Wilson bushing-type dies. Wilson bushings also play nice in Redding, Hornady, and RCBS bushing dies if that's what's on your bench. One handy trait worth knowing: Wilson bushings are tapered, so flipping one over nets you a touch more neck tension when you need it.
If you're developing loads, shooting benchrest, or just want your groups to tighten up, repeatable neck tension is one of the easiest gains to lock in. This .248 bushing is a small, no-fuss piece that pays off every time you size a case.
It refers to the diameter the bushing sizes the outside of your case neck to, in this case .248 inch. Wilson names its bushings using that thousandths-of-an-inch measurement. The marked size references the middle of the bushing, which is reamed with a slight taper.
Measure a loaded round at the neck where the bullet sits, then subtract .002 to .003 of an inch to find your bushing size. You can also calculate it by doubling your neck wall thickness, adding bullet diameter, and subtracting that same .002 to .003 for tension. Since brass brands vary in neck wall thickness, it's common to keep a bushing or two on either side of your target.
Yes. Wilson bushings interchange freely across Wilson neck and bushing-type full-length dies, and they also work in Redding, Hornady, and RCBS bushing dies. They do not fit Forster dies, which use a different design.
The Wilson neck die only sizes a small portion of the neck down from the mouth, so many reloaders run them with no lube at all and report no issues. If you prefer, a light wipe doesn't hurt, but these don't generate the heavy sizing forces a full-length pass does. It comes down to your own process and preference.
| UPC | 815145024381 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | B-248 |
| Shipping Weight | 0.02 |
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