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This is the Forster 0.331" neck bushing, part number BUSH-331, the little insert that does the heavy lifting when you want real control over neck tension at the reloading bench. Bushings like this one let you size your case necks to your exact spec instead of leaving it up to a fixed die. The bushing you pick determines the inside neck diameter, so you set how much grip the neck holds on the bullet. That kind of control is what separates a decent handload from one that shoots tight groups day after day.
Forster bushings are heat treated and then run through a super-cooled cryogenic process. That treatment refines the surface of the steel and closes it up, which is why these bushings feel so smooth when the brass passes through. A slicker bushing means less drag on the neck, straighter necks coming out, and more consistent bullet seating. Each one is honed to the precise inside diameter stamped on it, in this case 0.331 inches, so you know exactly what you're getting.
Sizing is simple once you measure. Take a caliper or micrometer reading of a loaded round right at the case neck, since that number reflects bullet diameter plus twice your neck wall thickness. From there, choose a bushing roughly .002 to .003 inch smaller than that measurement. After the neck springs back, you end up with a nice .001 to .002 inch of grip on the bullet. Bushings come in .001 inch increments, so you can fine tune neck tension to your brass and your load.
This one is built to run in Forster's Bushing Bump Neck Sizing Dies and Bushing Full Length Sizing Dies. Worth knowing up front that Forster bushings are their own animal and are not interchangeable with Redding or L.E. Wilson bushings, so make sure you're running it in the right die. If you've already got a Forster bushing setup, this drops right in and gets you back to loading.
It's designed for Forster's Bushing Bump Neck Sizing Dies and Bushing Full Length Sizing Dies. Keep in mind Forster bushings are not interchangeable with Redding or L.E. Wilson bushings, so it needs to run in a Forster die.
Measure a loaded round with a caliper or micrometer right at the case neck. That reading is your bullet diameter plus twice the neck wall thickness. Pick a bushing about .002 to .003 inch smaller than that number, and the 0.331" may be your match depending on your brass and bullet.
After heat treating, Forster runs these bushings through a super-cooled cryogenic process that refines and closes the steel's surface. The result is an ultra-smooth bore that reduces drag on the neck. That smoother pass helps produce straighter necks and more consistent loaded rounds.
Not necessarily. Since bushings come in .001 inch increments, many handloaders keep a few sizes on hand to fine tune neck tension for different brass or loads. The 0.331" is one specific size, so match it to the measurement you take off your loaded rounds.
| UPC | 757253998256 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BUSH-331 |
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