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Neck tension is one of those little details that separates ho-hum groups from the kind that make you double-check your target. This Forster 0.313" Neck Bushing (part number BUSH-313) gives you precise control over exactly how much grip your case necks put on your bullets, and it drops straight into Forster's Bushing Bump Neck Sizing Dies and Bushing Full Length Sizing Dies. Forster builds its bushings in .001 inch increments, so you can fine-tune to match your brass and your chamber instead of settling for whatever comes standard.
Every Forster neck bushing goes through a cryogenic treatment process that refines the steel's surface and closes up the grain. The result is an interior finish that sizes necks smooth as silk and holds up over a long reloading life. Each bushing is heat treated and honed to the exact inside diameter stamped on it, so the 0.313" marking is the measurement you're getting. Less drag on the brass means straighter necks and better concentricity on your loaded rounds.
A good starting point is to measure the outside neck diameter of several loaded cartridges and choose a bushing roughly .002 inch smaller than that figure. If you want a touch more bullet grip, go .003 inch under instead. Keep in mind that after brass has been fired several times it work-hardens, and you may need to step down to a smaller bushing to keep the same initial bullet tension. If you're loading for a tight-chambered rifle or turning your necks, your ideal size may differ from someone running factory-chambered brass with thicker walls.
These bushings are made specifically for Forster's bushing-style dies and are not cross-compatible with Redding or L.E. Wilson bushings. When you seat it, the chamfered side faces down into the die body. If you already run a Forster bushing die, this is a simple, affordable way to expand your tuning range and chase that extra bit of precision.
No. Forster neck bushings are made specifically for Forster's Bushing Bump Neck Sizing Dies and Bushing Full Length Sizing Dies. They are not interchangeable with Redding or L.E. Wilson bushings, so you'll want to pair this one with a Forster bushing die.
Measure the outside neck diameter of several of your loaded cartridges, then pick a bushing about .002 inch smaller than that measurement. If you want extra bullet grip, go .003 inch under instead. The 0.313" size works best when your loaded neck measures around .315 inch, though your exact brass and chamber determine the final choice.
Forster runs its bushings through a cryogenic super-cooling process that refines the steel surface and closes the grain. The bushings are then heat treated and honed to the precise inside diameter marked on them. That smooth interior reduces drag on the brass for straighter necks and better concentricity.
Insert it with the chamfered side facing down into the top of the die body. From there you snug the decapping and expander assembly back in until it contacts the bushing. The included die instructions walk through the full setup step by step.
| UPC | 757253991516 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BUSH-313 |
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