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Rifles, Reloading, Optics, Equipment
Reloading
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<blockquote data-quote="JASmith" data-source="post: 2151619" data-attributes="member: 24844"><p>Thanks for posting those runs! They will help a lot of us.</p><p></p><p>A note of caution about pressures, however: Neither QL nor QRT do well in predicting pressures. This is not a matter of being conservative. Both can under-predict in some situations and significantly under-predict in others.</p><p></p><p>Over-predicting, while annoying, does not particularly raise a safety issue. </p><p></p><p><em>UNDER-PREDICTING, </em>on the other hands means the actual pressures will be <em>HIGHER</em> than predicted. So, if the calculated pressure is used as a guide for starting loads, one can actually <strong><em>get unsafe pressures even when starting 10% below.</em></strong></p><p></p><p>The good news is that the bullet time is reported to be reasonably accurate for establishing velocity nodes for new powder.</p></blockquote><p></p>
[QUOTE="JASmith, post: 2151619, member: 24844"] Thanks for posting those runs! They will help a lot of us. A note of caution about pressures, however: Neither QL nor QRT do well in predicting pressures. This is not a matter of being conservative. Both can under-predict in some situations and significantly under-predict in others. Over-predicting, while annoying, does not particularly raise a safety issue. [I]UNDER-PREDICTING, [/I]on the other hands means the actual pressures will be [I]HIGHER[/I] than predicted. So, if the calculated pressure is used as a guide for starting loads, one can actually [B][I]get unsafe pressures even when starting 10% below.[/I][/B] The good news is that the bullet time is reported to be reasonably accurate for establishing velocity nodes for new powder. [/QUOTE]
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