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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Progressive twist rifling
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<blockquote data-quote="RockyMtnMT" data-source="post: 1294820" data-attributes="member: 7999"><p>I think I spoke with you on the phone the other day. If it was not you it was someone else with the same basic question.</p><p></p><p>From my end I will answer the pressure question. With our PDR (parabolic drag reduction) technology, the engraving forces are greatly reduced. The PDR because of the multiple radius on the baring surface there is just enough bullet surface in contact with the grooves to seal the bore. The actual contact is taken to a very small amount. The down side of the PDR, or the valleys, are deeper than the bore dia allowing the displaced copper from the rifling a place to deposit. Because of the shape of the PDR the rifling as it engraves the bullet is increases the amount of bullet it engages as it engraves deeper in to the PDR thus giving plenty of 'meat' for the bullet to fully engage the rifling and not have any trouble with spinning out. Spinning out meaning slipping in the rifling and not fully stabilizing. The bullets are plenty tough to handle launch in big horse power heavy bullet combos with the same exact design as in our smaller bullets. The need for a progressive twist rifling is not needed with our bullets. Because of the PDR on the Hammer Bullets they do not have the high pressure typically developed by non lead bullets. Usually they will run a little lower pressure than like weight cup and core lead bullets. In most rifles producing a little more vel than is typical for the bullet weight. So as the bullets ease into full engagement with the bore and grooves because of the PDR, it eliminates the problems typically seen with other all copper bullets.</p><p></p><p>I hope this helps.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 1294820, member: 7999"] I think I spoke with you on the phone the other day. If it was not you it was someone else with the same basic question. From my end I will answer the pressure question. With our PDR (parabolic drag reduction) technology, the engraving forces are greatly reduced. The PDR because of the multiple radius on the baring surface there is just enough bullet surface in contact with the grooves to seal the bore. The actual contact is taken to a very small amount. The down side of the PDR, or the valleys, are deeper than the bore dia allowing the displaced copper from the rifling a place to deposit. Because of the shape of the PDR the rifling as it engraves the bullet is increases the amount of bullet it engages as it engraves deeper in to the PDR thus giving plenty of 'meat' for the bullet to fully engage the rifling and not have any trouble with spinning out. Spinning out meaning slipping in the rifling and not fully stabilizing. The bullets are plenty tough to handle launch in big horse power heavy bullet combos with the same exact design as in our smaller bullets. The need for a progressive twist rifling is not needed with our bullets. Because of the PDR on the Hammer Bullets they do not have the high pressure typically developed by non lead bullets. Usually they will run a little lower pressure than like weight cup and core lead bullets. In most rifles producing a little more vel than is typical for the bullet weight. So as the bullets ease into full engagement with the bore and grooves because of the PDR, it eliminates the problems typically seen with other all copper bullets. I hope this helps. Steve [/QUOTE]
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Progressive twist rifling
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