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Rifles, Reloading, Optics, Equipment
Reloading
300 win mag and 215 Berger questions
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<blockquote data-quote="stonehands1" data-source="post: 1819602" data-attributes="member: 88929"><p>While this is true in some cartridges it does not apply to every cartridge. Case in point when developing loads for a weatherby cartridges, seating bullets out .200 from sammi has actually lowered measured velocity. I believe this is due to increasing case volume. Have also seen this when seating out as little as .020-.030 as well. </p><p>That being said I have also seen pressure increase when seating bullets at the lands. </p><p>I agree with your analogy in theory but have seen the opposite in testing. A lot of Leade angle will cause pressure signs below calculated velocity in new barrels. Once the rifling is eroded enough so as to create a lower leade angle pressure signs go away and velocity will increase.</p></blockquote><p></p>
[QUOTE="stonehands1, post: 1819602, member: 88929"] While this is true in some cartridges it does not apply to every cartridge. Case in point when developing loads for a weatherby cartridges, seating bullets out .200 from sammi has actually lowered measured velocity. I believe this is due to increasing case volume. Have also seen this when seating out as little as .020-.030 as well. That being said I have also seen pressure increase when seating bullets at the lands. I agree with your analogy in theory but have seen the opposite in testing. A lot of Leade angle will cause pressure signs below calculated velocity in new barrels. Once the rifling is eroded enough so as to create a lower leade angle pressure signs go away and velocity will increase. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
300 win mag and 215 Berger questions
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