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Rifles, Reloading, Optics, Equipment
Reloading
What is my length to lands?
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<blockquote data-quote="Bart B" data-source="post: 803708" data-attributes="member: 5302"><p>The only good place on a case to measure the distance the bullet jumps to the lands is its shoulder. That's hard against the chamber shoulder which is a fixed distance back from the lands; when the barrel's new anyway. Then it lengthens as the leade wears/erodes away.</p><p></p><p>Measuring from the case head introduces all sorts of variables.</p><p></p><p>A few thousandths spread is normal anyway. No batch of bullets have exactly the same ogive shape. They all vary a tiny bit 'cause the jackets and cores are not dimensionall perfect.</p><p></p><p>Use an approximation within a few thousandths and leave it that way. You'll never know the difference unless you can shoot your stuff into no worse than 1/10th MOA at 1000 yards anyway.</p></blockquote><p></p>
[QUOTE="Bart B, post: 803708, member: 5302"] The only good place on a case to measure the distance the bullet jumps to the lands is its shoulder. That's hard against the chamber shoulder which is a fixed distance back from the lands; when the barrel's new anyway. Then it lengthens as the leade wears/erodes away. Measuring from the case head introduces all sorts of variables. A few thousandths spread is normal anyway. No batch of bullets have exactly the same ogive shape. They all vary a tiny bit 'cause the jackets and cores are not dimensionall perfect. Use an approximation within a few thousandths and leave it that way. You'll never know the difference unless you can shoot your stuff into no worse than 1/10th MOA at 1000 yards anyway. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
What is my length to lands?
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