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Rifles, Reloading, Optics, Equipment
Reloading
Bushing die increasing run-out
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<blockquote data-quote="Mikecr" data-source="post: 1015474" data-attributes="member: 1521"><p>Sometimes reducing runout is trial & error, and another press might produce better results. Sometimes reducing runout means measurement to find the root cause.</p><p></p><p>It is normal for the bushing to float(by design). A press can cause some runout as well.</p><p>The main cause of runout is thickness variance in the cases. This is concealed with fire-forming, and brought out again and again(often worse each time) with sizing, because differing thickness springs back differently, and sizing is adding energy to it.</p><p></p><p>Other contributers to high runout are poor case design, poor chamber design, and of course excess sizing.</p><p>Loaded runout(as measured off bullets) can jump dramatically with a seating problem.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1015474, member: 1521"] Sometimes reducing runout is trial & error, and another press might produce better results. Sometimes reducing runout means measurement to find the root cause. It is normal for the bushing to float(by design). A press can cause some runout as well. The main cause of runout is thickness variance in the cases. This is concealed with fire-forming, and brought out again and again(often worse each time) with sizing, because differing thickness springs back differently, and sizing is adding energy to it. Other contributers to high runout are poor case design, poor chamber design, and of course excess sizing. Loaded runout(as measured off bullets) can jump dramatically with a seating problem. [/QUOTE]
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Bushing die increasing run-out
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