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Rifles, Reloading, Optics, Equipment
Reloading
Bushing size selection
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<blockquote data-quote="Mikecr" data-source="post: 1907518" data-attributes="member: 1521"><p>Subtract 2thou from loaded neck OD (measured or calculated). </p><p>That's a baseline bushing selection, given a chamber neck clearance around 3thou. </p><p>This would provide 1thou interference for seating bullets.</p><p>You can then adjust neck tension via LENGTH of that bushing sizing.</p><p></p><p>If your neck clearance is higher, subtract only 1thou from loaded OD.</p><p>The greater downsizing will roll brass at a higher angle, reducing the neck more than stamped on the bushing.</p><p></p><p>If you don't know chamber clearance, you can order both bushings.</p><p>One will provide a better result than the other.</p><p>There is no credible reason to excessively downsize necks, so forget any of that. Your expansion, button, mandrel, or bullet, would just undo it anyway.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1907518, member: 1521"] Subtract 2thou from loaded neck OD (measured or calculated). That's a baseline bushing selection, given a chamber neck clearance around 3thou. This would provide 1thou interference for seating bullets. You can then adjust neck tension via LENGTH of that bushing sizing. If your neck clearance is higher, subtract only 1thou from loaded OD. The greater downsizing will roll brass at a higher angle, reducing the neck more than stamped on the bushing. If you don't know chamber clearance, you can order both bushings. One will provide a better result than the other. There is no credible reason to excessively downsize necks, so forget any of that. Your expansion, button, mandrel, or bullet, would just undo it anyway. [/QUOTE]
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Bushing size selection
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