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Rifles, Reloading, Optics, Equipment
Reloading
Purpose of bullet jump
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<blockquote data-quote="Mikecr" data-source="post: 1795283" data-attributes="member: 1521"><p>Please bear with an analogy here:</p><p>If you cause a high chamber end clearance then gases can migrate backward around the necks to affect neck sealing, and velocity spreads. A carbon ring forms so results can keep changing. Reducing that chamber end clearance to alleviate the issue can affect your tune better/worse. It is possible to creep into/out of tune with case trim lengths, not only because of end clearances, but by adding/subtracting neck brass that is gripping bullets (tension). But this is not commonly acted on as tuning. </p><p>Case trim is considered a <u>precondition</u>, which we establish with intent to maintain, PRIOR to tuning.</p><p></p><p>Now wonder;</p><p>COULD case trimming be considered tuning? COULD we shoot 'sine waves' through case trimming? YEP,, and YEP</p><p>Should we? NOPE,, and NO WAY</p><p></p><p>I submit that tuning, and preconditions for tuning, are different animals.</p><p>That bullet seating, primers, and case/chamber fitting are preconditions.</p><p>Testing is absolutely needed to establish these preconditions as best.</p><p>But this testing is not tuning.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1795283, member: 1521"] Please bear with an analogy here: If you cause a high chamber end clearance then gases can migrate backward around the necks to affect neck sealing, and velocity spreads. A carbon ring forms so results can keep changing. Reducing that chamber end clearance to alleviate the issue can affect your tune better/worse. It is possible to creep into/out of tune with case trim lengths, not only because of end clearances, but by adding/subtracting neck brass that is gripping bullets (tension). But this is not commonly acted on as tuning. Case trim is considered a [U]precondition[/U], which we establish with intent to maintain, PRIOR to tuning. Now wonder; COULD case trimming be considered tuning? COULD we shoot 'sine waves' through case trimming? YEP,, and YEP Should we? NOPE,, and NO WAY I submit that tuning, and preconditions for tuning, are different animals. That bullet seating, primers, and case/chamber fitting are preconditions. Testing is absolutely needed to establish these preconditions as best. But this testing is not tuning. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Purpose of bullet jump
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