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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Rebated Boat Tail bullet question
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<blockquote data-quote="Fiftydriver" data-source="post: 67322" data-attributes="member: 10"><p>Len,</p><p></p><p>I have not used the Cauterucio bullets so I can not comment on them but I have seen deformation on thin jacketed VLD bullets such as the Bergers with the J-4 jackets if neck tension is to high.</p><p></p><p>There is actually a slight swaging effect that occurs at the bsae of the bullet.</p><p></p><p>To be honest, the only real reason I know this is because quite awhile back when Moly was really the in thing to be using. I did some testing on case mouth chamfer angles to see which was best for using Moly coated VLD bullets.</p><p></p><p>Depending on the coating process used, the conventional chamfer angles marked up the bullets much more then the steeper angled VLD chamfering tools.</p><p></p><p>THis led me to measure bullet bases and I often found that using a conventional angle would reduce bullet base diameter by as much as 0.0003". Now some of this may have been from actual material being removed but in many cases it appeared to be more from the swaging effect of the steep anlge.</p><p></p><p>THis is another benefit of thin necked cases as they have much less neck tension when used correctly and bullet deformation is dramatically less.</p><p></p><p>Now I will also say that if your cases are sized properly to offer the correct 0.001 to 0.002" of press fit over the bullet, and your cases are chamfered smootly with no remaining burrs at all, I have not seen a problem with the heavier jacketed match bullets such as the Sierra MK and the heavy jacketed Wildcat bullets.</p><p></p><p>The steeper anlge certainly works much better when loading thin jacketed VLD bullets, espeically in cases used for big game hunting where slightly more neck tension may be desired.</p><p></p><p>I will also say that I have not proven that this actually detracts from the accuracy potential of the bullet as when it is punched in the rear by hot gases it will expand to fill any void that may have been imposed on the bullet during seating. </p><p></p><p>I have actually measured this and seen a difference in bullet base diameter with the thin jacketed bullets. Again I have not used the Cauterucio bullets so I can not say with those.</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 67322, member: 10"] Len, I have not used the Cauterucio bullets so I can not comment on them but I have seen deformation on thin jacketed VLD bullets such as the Bergers with the J-4 jackets if neck tension is to high. There is actually a slight swaging effect that occurs at the bsae of the bullet. To be honest, the only real reason I know this is because quite awhile back when Moly was really the in thing to be using. I did some testing on case mouth chamfer angles to see which was best for using Moly coated VLD bullets. Depending on the coating process used, the conventional chamfer angles marked up the bullets much more then the steeper angled VLD chamfering tools. THis led me to measure bullet bases and I often found that using a conventional angle would reduce bullet base diameter by as much as 0.0003". Now some of this may have been from actual material being removed but in many cases it appeared to be more from the swaging effect of the steep anlge. THis is another benefit of thin necked cases as they have much less neck tension when used correctly and bullet deformation is dramatically less. Now I will also say that if your cases are sized properly to offer the correct 0.001 to 0.002" of press fit over the bullet, and your cases are chamfered smootly with no remaining burrs at all, I have not seen a problem with the heavier jacketed match bullets such as the Sierra MK and the heavy jacketed Wildcat bullets. The steeper anlge certainly works much better when loading thin jacketed VLD bullets, espeically in cases used for big game hunting where slightly more neck tension may be desired. I will also say that I have not proven that this actually detracts from the accuracy potential of the bullet as when it is punched in the rear by hot gases it will expand to fill any void that may have been imposed on the bullet during seating. I have actually measured this and seen a difference in bullet base diameter with the thin jacketed bullets. Again I have not used the Cauterucio bullets so I can not say with those. Good Shooting!! Kirby Allen(50) [/QUOTE]
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Rebated Boat Tail bullet question
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