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Rifles, Reloading, Optics, Equipment
Reloading
Bullet Seating Depth
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<blockquote data-quote="Mikecr" data-source="post: 2278361" data-attributes="member: 1521"><p>Throat erosion and accurate barrel life may loosely seem to correlate, but they're mostly unrelated.</p><p></p><p>What ultimately kills accuracy from a bore is carbon constrictions (not erosion).</p><p>The heat impinges carbon into the bore surface, raising it -in some places. In other places this does not occur, but where the bullet was already swaged/damaged, it no longer fits right beyond. </p><p></p><p>Grouping opens from this, and for the folks who actually reach and demonstrate peak precision from bores, they see the change occur like a flipped switch. Many point blank BR shooters J-B lap between matches, or even relays, to manage this. Their accurate barrel life is not long (~900rnds), and they don't hesitate to spin another barrel on when they see the flashing sign. That is, when J-B treatment no longer recovers performance.</p><p>I've noticed occasions when a barrel shot so well(a hummer) that a shooter just didn't want to let it go. They would have it set back, and get another 200rnds of peak performance. But that was all they got,, it was dubious,, and hardly worth it. What they briefly recovered there was high starting pressure, not accurate barrel life.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2278361, member: 1521"] Throat erosion and accurate barrel life may loosely seem to correlate, but they're mostly unrelated. What ultimately kills accuracy from a bore is carbon constrictions (not erosion). The heat impinges carbon into the bore surface, raising it -in some places. In other places this does not occur, but where the bullet was already swaged/damaged, it no longer fits right beyond. Grouping opens from this, and for the folks who actually reach and demonstrate peak precision from bores, they see the change occur like a flipped switch. Many point blank BR shooters J-B lap between matches, or even relays, to manage this. Their accurate barrel life is not long (~900rnds), and they don't hesitate to spin another barrel on when they see the flashing sign. That is, when J-B treatment no longer recovers performance. I've noticed occasions when a barrel shot so well(a hummer) that a shooter just didn't want to let it go. They would have it set back, and get another 200rnds of peak performance. But that was all they got,, it was dubious,, and hardly worth it. What they briefly recovered there was high starting pressure, not accurate barrel life. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Bullet Seating Depth
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