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Rifles, Reloading, Optics, Equipment
Reloading
Hoover Meplat Timmer and Pointing Die System .338 Lapua
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<blockquote data-quote="Bart B" data-source="post: 796652" data-attributes="member: 5302"><p>Note the ogive shape across a box of bullets is also not absolutely perfect. If one measures (with precision tools) the distance from the bullet base to a given diameter on the ogive, there'll be .001" or more spread in the readings.</p><p></p><p>There's also the unbalance issue. Maybe 2 or 3 bullets out of 100 will be perfectly balanced. All the others' differences in jacket thickness, core and jacket metalurgy as well as the core's actual shape are the cause. Spinning them at 30,000 to 40,000 rpm and measuring the centrifugal forces their out of balance causes lets you separate the perfect ones from the others. Tests with perfectly balanced bullets show they will shave 1/4 MOA or more off long range groups.</p></blockquote><p></p>
[QUOTE="Bart B, post: 796652, member: 5302"] Note the ogive shape across a box of bullets is also not absolutely perfect. If one measures (with precision tools) the distance from the bullet base to a given diameter on the ogive, there'll be .001" or more spread in the readings. There's also the unbalance issue. Maybe 2 or 3 bullets out of 100 will be perfectly balanced. All the others' differences in jacket thickness, core and jacket metalurgy as well as the core's actual shape are the cause. Spinning them at 30,000 to 40,000 rpm and measuring the centrifugal forces their out of balance causes lets you separate the perfect ones from the others. Tests with perfectly balanced bullets show they will shave 1/4 MOA or more off long range groups. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Hoover Meplat Timmer and Pointing Die System .338 Lapua
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