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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger VLD vs Berger Match Hunting VLD
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<blockquote data-quote="AZShooter" data-source="post: 455903" data-attributes="member: 5219"><p>According to the people that said a 3 groove would be part of the problem said the width of the lands combined with the roughness of a partially worn throat would weaken the jacket material enough to cause bullet failure when combined with such a fast twist. </p><p></p><p>Any idea of the RPMs of a bullet leaving a 7mm 1 in 7 twist compared to a commonly used 1 in 9?</p><p>formula: MV x 720/twist </p><p>180 Berger VLD @ 3000 from 1 in 7 = 308,571 RPMs</p><p> 180 " " @ 3000 from 1 in 9= 240,000 RPMs</p><p></p><p>Speaking of RPMs: that rifle now shoots the 140 accubond @ 3400 fps from that 30" barrel. Tried 160s accubonds but first attempts were poor. May try again this spring. </p><p></p><p>140 Accubond 1in7 @ 3400 = 349,714</p><p>compared to 1 in 9 @ 3400 = 272,000</p><p>I didn't use it for coues wt this year but have been wondering how the extra RPMs might effect an animal.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 455903, member: 5219"] According to the people that said a 3 groove would be part of the problem said the width of the lands combined with the roughness of a partially worn throat would weaken the jacket material enough to cause bullet failure when combined with such a fast twist. Any idea of the RPMs of a bullet leaving a 7mm 1 in 7 twist compared to a commonly used 1 in 9? formula: MV x 720/twist 180 Berger VLD @ 3000 from 1 in 7 = 308,571 RPMs 180 " " @ 3000 from 1 in 9= 240,000 RPMs Speaking of RPMs: that rifle now shoots the 140 accubond @ 3400 fps from that 30" barrel. Tried 160s accubonds but first attempts were poor. May try again this spring. 140 Accubond 1in7 @ 3400 = 349,714 compared to 1 in 9 @ 3400 = 272,000 I didn't use it for coues wt this year but have been wondering how the extra RPMs might effect an animal. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Berger VLD vs Berger Match Hunting VLD
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