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Rifles, Reloading, Optics, Equipment
Reloading
How to develop an accurate load? Development process?
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<blockquote data-quote="Mikecr" data-source="post: 870600" data-attributes="member: 1521"><p>You don't have .003" of tension, you have .003" of interference fit. There is a difference.</p><p>Tension is springback, and yes it does affect a load. Causing a big interference fit = overworking necks = changing springback. A big interference fit also means higher seating forces = higher seating variance.</p><p>Ideally you would take it ~2thou under cal, then mandrel pre-expand to ~1thou under cal(after springback), prior to seating.</p><p>This helps keeps tension variance and runout low, while allowing very accurate seating.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 870600, member: 1521"] You don't have .003" of tension, you have .003" of interference fit. There is a difference. Tension is springback, and yes it does affect a load. Causing a big interference fit = overworking necks = changing springback. A big interference fit also means higher seating forces = higher seating variance. Ideally you would take it ~2thou under cal, then mandrel pre-expand to ~1thou under cal(after springback), prior to seating. This helps keeps tension variance and runout low, while allowing very accurate seating. [/QUOTE]
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How to develop an accurate load? Development process?
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