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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Clean bore vs. fouled bore for 1st shot accuracy
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<blockquote data-quote="Bart B" data-source="post: 670431" data-attributes="member: 5302"><p>Barrels with properly lapped smooth lands and grooves, properly stress relieved and correctly fit to receivers typically shoot within 1/4 MOA for their first through many shots up through 300 yards. At longer ranges, the slight amount of fouling that builds up from a squeaky clean bore may cause later shots to leave faster from higher pressure and therefore shoot 1/4 MOA higher at longer ranges after the first few shots.</p><p></p><p>Factory standard barrels are not quite as smooth as high end aftermarket ones, so they often take a few shots to settle down and shoot to the same place. If they're not fit well to the receiver and/or not stress relieved good, they'll start walking shots as they get hot. Otherwise, after a few to several shots, factory barrels tend to settle down.</p><p></p><p>Properly test your barrels with the bullets of choice and find out where it shoots with the first through 10th shot with various levels of cleaning from none to all fouling totaly removed.</p><p></p><p>I have never used coated bullets except once on an international team in practice when one half day we used moly coated ones and the other half day shot naked ones. The naked ones shot more accurate. Shoot whatever bullets you want to.</p></blockquote><p></p>
[QUOTE="Bart B, post: 670431, member: 5302"] Barrels with properly lapped smooth lands and grooves, properly stress relieved and correctly fit to receivers typically shoot within 1/4 MOA for their first through many shots up through 300 yards. At longer ranges, the slight amount of fouling that builds up from a squeaky clean bore may cause later shots to leave faster from higher pressure and therefore shoot 1/4 MOA higher at longer ranges after the first few shots. Factory standard barrels are not quite as smooth as high end aftermarket ones, so they often take a few shots to settle down and shoot to the same place. If they're not fit well to the receiver and/or not stress relieved good, they'll start walking shots as they get hot. Otherwise, after a few to several shots, factory barrels tend to settle down. Properly test your barrels with the bullets of choice and find out where it shoots with the first through 10th shot with various levels of cleaning from none to all fouling totaly removed. I have never used coated bullets except once on an international team in practice when one half day we used moly coated ones and the other half day shot naked ones. The naked ones shot more accurate. Shoot whatever bullets you want to. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Clean bore vs. fouled bore for 1st shot accuracy
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