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Optimizing Precision And Accuracy From VLD Bullets By Eric Stecker
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<blockquote data-quote="BryanLitz" data-source="post: 281135" data-attributes="member: 7848"><p>Titan,</p><p>Hello and welcome to the site!</p><p></p><p>The 'sweet spot method' described in Eric's article will work best for bullets having secant ogives (meaning ogives profiled like the VLD) because they're the nose type that's most sensitive to seating depth. Other examples of secant ogives are: most of the Hornady Vmax and Amax bullets, the .30 cal 155 grain Lapua Scenar, and most of the JLK bullets.</p><p></p><p>Of course all bullets are sensitive to seating depth to some degree, but those having tangent ogives (nose meets bearing surface smoothly) are much less sensitive so the accuracy isn't related to seating depth <em>as much</em> as it is for secant ogives. Examples of tangent ogive bullets are: any Nosler bullet, most Sierra's, Berger's BT bullets, etc.</p><p></p><p>One commonly accepted reason for 'why' secant ogive bullets are more sensitive to seating depth is because that shape doesn't naturally self-center itself in the riflings as well as a tangent ogive, so it's more prone to <em>tilting</em> as it enters the riflings. As you probably know, a bullet tilting as it enters the riflings is bad for precision.</p><p></p><p>Hope this helps,</p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 281135, member: 7848"] Titan, Hello and welcome to the site! The 'sweet spot method' described in Eric's article will work best for bullets having secant ogives (meaning ogives profiled like the VLD) because they're the nose type that's most sensitive to seating depth. Other examples of secant ogives are: most of the Hornady Vmax and Amax bullets, the .30 cal 155 grain Lapua Scenar, and most of the JLK bullets. Of course all bullets are sensitive to seating depth to some degree, but those having tangent ogives (nose meets bearing surface smoothly) are much less sensitive so the accuracy isn't related to seating depth [i]as much[/i] as it is for secant ogives. Examples of tangent ogive bullets are: any Nosler bullet, most Sierra's, Berger's BT bullets, etc. One commonly accepted reason for 'why' secant ogive bullets are more sensitive to seating depth is because that shape doesn't naturally self-center itself in the riflings as well as a tangent ogive, so it's more prone to [i]tilting[/i] as it enters the riflings. As you probably know, a bullet tilting as it enters the riflings is bad for precision. Hope this helps, -Bryan [/QUOTE]
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