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Rifles, Reloading, Optics, Equipment
Reloading
How does chopping a barrel alter velocity nodes?
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<blockquote data-quote="Doom2" data-source="post: 2093098" data-attributes="member: 108323"><p>Changing barrel length will not affect maximum pressure. Changing the barrel length does affect harmonics. The degree to which varies with the amount removed and the profile. The degree to which this affects the accuracy of a given load varies. It should not affect the extreme spread of a load, assuming the crowns are consistent in both cases.</p><p></p><p>It seems that most people find similar nodes both in 223 and 308, regardless of barrel length or profile, in different manufacturer's rifles with different stocks. This tends to indicate that barrel length is not a significant factor in determining accurate loads. </p><p></p><p>If you consider the standard for factory ammunition in 308, Fed Gold Medal Match, 168 gr, this round shoots accurately in almost every length barrel. In almost every gun!</p><p></p><p>I would load from a half grain lower to a half grain higher than your present load. You should not need to perform a complete workup.</p><p></p><p>That said, in the case of rifles using slow powders, the reduction in barrel length can have some major velocity impacts on velocity as these powders maintain higher pressures further down the barrel. In the case of the 7mm Rem, I would not think an 18" barrel would be desirable.</p></blockquote><p></p>
[QUOTE="Doom2, post: 2093098, member: 108323"] Changing barrel length will not affect maximum pressure. Changing the barrel length does affect harmonics. The degree to which varies with the amount removed and the profile. The degree to which this affects the accuracy of a given load varies. It should not affect the extreme spread of a load, assuming the crowns are consistent in both cases. It seems that most people find similar nodes both in 223 and 308, regardless of barrel length or profile, in different manufacturer’s rifles with different stocks. This tends to indicate that barrel length is not a significant factor in determining accurate loads. If you consider the standard for factory ammunition in 308, Fed Gold Medal Match, 168 gr, this round shoots accurately in almost every length barrel. In almost every gun! I would load from a half grain lower to a half grain higher than your present load. You should not need to perform a complete workup. That said, in the case of rifles using slow powders, the reduction in barrel length can have some major velocity impacts on velocity as these powders maintain higher pressures further down the barrel. In the case of the 7mm Rem, I would not think an 18” barrel would be desirable. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
How does chopping a barrel alter velocity nodes?
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