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Rifles, Reloading, Optics, Equipment
Reloading
Berger 7mm 168gr VLD Hunting twist rate discrepancy
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<blockquote data-quote="Shootin4fun" data-source="post: 1723850" data-attributes="member: 28741"><p>L- You are doing right to check each box BTO. </p><p>I emailed Berger and received this answer an hour later (great customer service!):</p><p></p><p>"This will explain the BC change :<a href="https://bergerbullets.com/12/" target="_blank">https://bergerbullets.com/12/</a> and <a href="https://bergerbullets.com/update-of-berger-bullets-performance-data/" target="_blank">https://bergerbullets.com/update-of-berger-bullets-performance-data/</a> The BC numbers for the 7mm 168gr VLD Hunting Bullet (28501) are now 0.618 = G1 BC , 0.316 = G7 BC . </p><p>New boxes will have a MINIMUM twist rate or faster of 1-10 . Old OPTIMAL barrel twist rate was 1-9 . Both are based on 59 degrees at sea level. </p><p>I regards to the lot differences in bullet base to ogive. This will explain :<a href="https://bergerbullets.com/information/why-berger/" target="_blank">https://bergerbullets.com/information/why-berger/</a> . </p><p><strong>When you change a lot of bullets. The first thing to check is the CBTO of the new lot against the CBTO of the old lot.</strong> It should be the same or very, very close. If there is a drastic difference and your seating die does NOT have a VLD bullet seating stem installed. Please get one. Big differences in CBTO or COAL are a key indicator that the tip of the bullet is contacting the base of the bullet seating stem cavity. This should never be the case with ANY bullet! If everything checks out between the CBTOs of the old and new lot. Reduce the powder charge 1 grain and work back up in 1/10th grain increments to get on your velocity accuracy node. This would also be the same if you changed lots of powders , ETC . If you have any more questions please feel free to contact us at any time! "</p><p></p><p>It's great to deal with a company who stands behind their products and keeps an open line of communication with their end users. Think about what the latter means. There are probably a hundred thousand+ people buying their bullets, and they respond to each one of them who has a random question. That is commitment right there. Not only that, but they publish articles explaining exactly how they arrive at their various conclusions (which can be seen in the links they provided above). </p><p></p><p>Thank you Berger!</p></blockquote><p></p>
[QUOTE="Shootin4fun, post: 1723850, member: 28741"] L- You are doing right to check each box BTO. I emailed Berger and received this answer an hour later (great customer service!): "This will explain the BC change :[URL]https://bergerbullets.com/12/[/URL] and [URL]https://bergerbullets.com/update-of-berger-bullets-performance-data/[/URL] The BC numbers for the 7mm 168gr VLD Hunting Bullet (28501) are now 0.618 = G1 BC , 0.316 = G7 BC . New boxes will have a MINIMUM twist rate or faster of 1-10 . Old OPTIMAL barrel twist rate was 1-9 . Both are based on 59 degrees at sea level. I regards to the lot differences in bullet base to ogive. This will explain :[URL]https://bergerbullets.com/information/why-berger/[/URL] . [B]When you change a lot of bullets. The first thing to check is the CBTO of the new lot against the CBTO of the old lot.[/B] It should be the same or very, very close. If there is a drastic difference and your seating die does NOT have a VLD bullet seating stem installed. Please get one. Big differences in CBTO or COAL are a key indicator that the tip of the bullet is contacting the base of the bullet seating stem cavity. This should never be the case with ANY bullet! If everything checks out between the CBTOs of the old and new lot. Reduce the powder charge 1 grain and work back up in 1/10th grain increments to get on your velocity accuracy node. This would also be the same if you changed lots of powders , ETC . If you have any more questions please feel free to contact us at any time! " It's great to deal with a company who stands behind their products and keeps an open line of communication with their end users. Think about what the latter means. There are probably a hundred thousand+ people buying their bullets, and they respond to each one of them who has a random question. That is commitment right there. Not only that, but they publish articles explaining exactly how they arrive at their various conclusions (which can be seen in the links they provided above). Thank you Berger! [/QUOTE]
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Berger 7mm 168gr VLD Hunting twist rate discrepancy
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