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Rifles, Reloading, Optics, Equipment
Reloading
Load development ?
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<blockquote data-quote="Mikecr" data-source="post: 649217" data-attributes="member: 1521"><p>With barrels I've developed for, which are med/heavy straight taper contours, there is some bore change with temperature transients(heating up). </p><p>The barrel heats from the bore outward and initially the bore is confined to expansion -inward, as the outer area hasn't yet sunk the heat to a stabilize dimensions. The colder outer area is not allowing the hotter bore to expand as much as it wants to(outward), so the bore expands inward(constricting) until it can finally swing outward(always least resistance). With this, performance can change.</p><p>But atleast in IBS & NBRSA you get a sighter period to freshly foul and bring the barrel to stable temps.</p><p>I can't imagine a competitor not utilizing this opportunity, given that everyone else is.</p><p></p><p>I'm not a competitor, but if I were, I would work out a prefouling and heat-up rate for that sighter period that provides the best results in record shots. There would always be a timer on my bench/rest.</p><p>You can't load develop with all this change though. You really need to get the bore stable before testing.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 649217, member: 1521"] With barrels I've developed for, which are med/heavy straight taper contours, there is some bore change with temperature transients(heating up). The barrel heats from the bore outward and initially the bore is confined to expansion -inward, as the outer area hasn't yet sunk the heat to a stabilize dimensions. The colder outer area is not allowing the hotter bore to expand as much as it wants to(outward), so the bore expands inward(constricting) until it can finally swing outward(always least resistance). With this, performance can change. But atleast in IBS & NBRSA you get a sighter period to freshly foul and bring the barrel to stable temps. I can't imagine a competitor not utilizing this opportunity, given that everyone else is. I'm not a competitor, but if I were, I would work out a prefouling and heat-up rate for that sighter period that provides the best results in record shots. There would always be a timer on my bench/rest. You can't load develop with all this change though. You really need to get the bore stable before testing. [/QUOTE]
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Load development ?
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