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Rifles, Reloading, Optics, Equipment
Reloading
BERGER BEWARE!
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<blockquote data-quote="Tiny Tim" data-source="post: 1913628" data-attributes="member: 87887"><p>While I have not personally done this, ultimately bullets from the same lot ought to be consistent in manufacture. Diameters measured at various points along the length of the bullet should be consistent. The least consistent measurement is that of OAL due to meplat deformity resulting from the ejecting pin. So no matter where you "push' the bullet in or measure length, it should be consistent so long as your not using the tip. All of these are "reference points". This is why it is generally ill advised to use say a Sinclair Hex Ogive measuring tool to set up a CBTO and then go to a buddies place and use his Hornady Ogive Comparator to set the same CBTO. It's likely you will have differing results and may or may not be safe. </p><p></p><p>If bullets change in the reference dimension with your comparator by .005", expect a difference of .005" difference in CBTO even though the seating stem contacts the bullet at a different point than your comparator. Even with this consistency, you may experience a variation of .015 when measuring COAL.</p><p></p><p>We'd like more consistency, but the realities of life and manufacturing processes say that what we have available to us today is nothing short of incredible. Sorry for the "book".</p></blockquote><p></p>
[QUOTE="Tiny Tim, post: 1913628, member: 87887"] While I have not personally done this, ultimately bullets from the same lot ought to be consistent in manufacture. Diameters measured at various points along the length of the bullet should be consistent. The least consistent measurement is that of OAL due to meplat deformity resulting from the ejecting pin. So no matter where you "push' the bullet in or measure length, it should be consistent so long as your not using the tip. All of these are "reference points". This is why it is generally ill advised to use say a Sinclair Hex Ogive measuring tool to set up a CBTO and then go to a buddies place and use his Hornady Ogive Comparator to set the same CBTO. It's likely you will have differing results and may or may not be safe. If bullets change in the reference dimension with your comparator by .005", expect a difference of .005" difference in CBTO even though the seating stem contacts the bullet at a different point than your comparator. Even with this consistency, you may experience a variation of .015 when measuring COAL. We'd like more consistency, but the realities of life and manufacturing processes say that what we have available to us today is nothing short of incredible. Sorry for the "book". [/QUOTE]
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Reloading
BERGER BEWARE!
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