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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
25-06 velocity?
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<blockquote data-quote="hemiford" data-source="post: 881218" data-attributes="member: 72104"><p>I believe barrel length and expansion ratio must be considered too.</p><p></p><p>270 and 25-06 have virtually identical powder weights, so to compare</p><p></p><p>apples to apples, they must also be given virtually identical barrel volumes,</p><p></p><p>so that the burn expands into a virtually identical volume and performs</p><p></p><p>a virtually identical amount of work on the projectiles.</p><p></p><p>A quick calculation shows that the 25-06 barrel should be 1.162 times</p><p></p><p>as long as the 270 barrel. So, for example, a 24-in 270 barrel would yield</p><p></p><p>the same expansion ratio as a 25-06 with a 27.9-in barrel.</p><p></p><p>Under these conditions, the lighter projectile should certainly have higher</p><p></p><p>muzzle velocity, regardless of caliber.</p></blockquote><p></p>
[QUOTE="hemiford, post: 881218, member: 72104"] I believe barrel length and expansion ratio must be considered too. 270 and 25-06 have virtually identical powder weights, so to compare apples to apples, they must also be given virtually identical barrel volumes, so that the burn expands into a virtually identical volume and performs a virtually identical amount of work on the projectiles. A quick calculation shows that the 25-06 barrel should be 1.162 times as long as the 270 barrel. So, for example, a 24-in 270 barrel would yield the same expansion ratio as a 25-06 with a 27.9-in barrel. Under these conditions, the lighter projectile should certainly have higher muzzle velocity, regardless of caliber. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
25-06 velocity?
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