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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger Twist Rate Stability Calculator (need help)
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<blockquote data-quote="Mikecr" data-source="post: 2024499" data-attributes="member: 1521"><p>It is anecdotal and no more than what I came up with decades ago to define failures reported with heavy for cal Berger VLDs. Sierras survived a bit more, but not a lot. There are of course condition variances which would defy the math. Light for cal bullets have less bearing to heat and pull apart, and good aftermarket barrels challenge jacket integrity less -for a while.</p><p>The 'limit' is not hard but conservative & reasonable as to maximum <em>reliable</em> velocity. It takes an extreme overbore to pass it, which will produce great heat, and bore damage,, both seriously challenging high BC bullets. Best example I know of is with 22cal 90gr VLDs needing 6.5-7tw. With these, there is a very thin margin between stable and blowup, from overbores like a 22-243imp (supporting 1kyd with that bullet).</p><p></p><p>But I would be surprised if the 87vmax holds up to 3600fps+. If it does, I think that by ~500rnds you'll lose some.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2024499, member: 1521"] It is anecdotal and no more than what I came up with decades ago to define failures reported with heavy for cal Berger VLDs. Sierras survived a bit more, but not a lot. There are of course condition variances which would defy the math. Light for cal bullets have less bearing to heat and pull apart, and good aftermarket barrels challenge jacket integrity less -for a while. The 'limit' is not hard but conservative & reasonable as to maximum [I]reliable[/I] velocity. It takes an extreme overbore to pass it, which will produce great heat, and bore damage,, both seriously challenging high BC bullets. Best example I know of is with 22cal 90gr VLDs needing 6.5-7tw. With these, there is a very thin margin between stable and blowup, from overbores like a 22-243imp (supporting 1kyd with that bullet). But I would be surprised if the 87vmax holds up to 3600fps+. If it does, I think that by ~500rnds you'll lose some. [/QUOTE]
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Berger Twist Rate Stability Calculator (need help)
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