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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Barrel fluting post build affect accuracy?
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<blockquote data-quote="Brent" data-source="post: 70137" data-attributes="member: 99"><p>Never have slugged a fouled bore to measure the change but, I do know that the buildup will increase pressure substantially. </p><p></p><p>I've measured a drop in pressure of what I want to say was 5-8 Kpsi depending on the bullet fired, this after cleaning a Lilja bore that was fouled with nearly 100 rounds. </p><p></p><p>At the time I was wondering if the cold temp was influencing the bore diameter, shrinking it and causing what were somewhat hot loads to become way too hot. </p><p></p><p>Roughening of the bore over the last couple hundred rounds obviously increased the pressure of what used to be quite medium loads. I also measured a pretty substantial loss of efficiency, at the same pressure (reducing my loads to do so) lost anywhere from 50-150 fps on all my loads since break in was complete. Probably around 300 rounds through the bore at that time.</p></blockquote><p></p>
[QUOTE="Brent, post: 70137, member: 99"] Never have slugged a fouled bore to measure the change but, I do know that the buildup will increase pressure substantially. I've measured a drop in pressure of what I want to say was 5-8 Kpsi depending on the bullet fired, this after cleaning a Lilja bore that was fouled with nearly 100 rounds. At the time I was wondering if the cold temp was influencing the bore diameter, shrinking it and causing what were somewhat hot loads to become way too hot. Roughening of the bore over the last couple hundred rounds obviously increased the pressure of what used to be quite medium loads. I also measured a pretty substantial loss of efficiency, at the same pressure (reducing my loads to do so) lost anywhere from 50-150 fps on all my loads since break in was complete. Probably around 300 rounds through the bore at that time. [/QUOTE]
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Barrel fluting post build affect accuracy?
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