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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
+P Throating
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<blockquote data-quote="Fiftydriver" data-source="post: 2588721" data-attributes="member: 10"><p>That is not entirely true. With the +p or my Hybrid throat, yes shorter barrel life. A True bore rider throat design does not have to be anything other then a conventional 1-30-00 leade angle but with no throat length at all.</p><p></p><p>a true bore rider bullet will have a bullet body that is nominal BORE diameter with the drive band which is nominal GROOVE diameter with the drive band being seated even or close to the case mouth. As such a conventional, long life throat design can be used, just with no throat at all.</p><p></p><p>i ran into issues years back with one companies bore rider bullets in my 375 Allen Magnum. We had used most of their 375 cal bullet offerings under 400 grains with great success in my standard throat chamber which had roughly a 0.300" long throat.</p><p></p><p>however once we started testing the 400 gr and heavier bullets, results were terrible. Long story short, some bore riders do not always work in standard throated rifles, especially when the bullets are extremely long and heavy and used in fast twist barrels at high speeds.</p><p></p><p>found that the drive bands could not hold the rifling after jumping to the lands. They would literally shear off. This bullet manufacturer said this would never happen with their bullets. However, once i had a reamer made that had a 1-30-00 leade angle right off the chamber mouth so i could seat the drive band right to the bullets there was not a single issue.</p><p></p><p>anyway, point being which i got way off track, a true bore riding bullet design can use a conventionally dimensioned leade angle with zero throat length which will result in a very long throat life.</p><p></p><p>a bore rider bullet in a +p or Hybrid throat would likely result on even shorter throat life….</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 2588721, member: 10"] That is not entirely true. With the +p or my Hybrid throat, yes shorter barrel life. A True bore rider throat design does not have to be anything other then a conventional 1-30-00 leade angle but with no throat length at all. a true bore rider bullet will have a bullet body that is nominal BORE diameter with the drive band which is nominal GROOVE diameter with the drive band being seated even or close to the case mouth. As such a conventional, long life throat design can be used, just with no throat at all. i ran into issues years back with one companies bore rider bullets in my 375 Allen Magnum. We had used most of their 375 cal bullet offerings under 400 grains with great success in my standard throat chamber which had roughly a 0.300” long throat. however once we started testing the 400 gr and heavier bullets, results were terrible. Long story short, some bore riders do not always work in standard throated rifles, especially when the bullets are extremely long and heavy and used in fast twist barrels at high speeds. found that the drive bands could not hold the rifling after jumping to the lands. They would literally shear off. This bullet manufacturer said this would never happen with their bullets. However, once i had a reamer made that had a 1-30-00 leade angle right off the chamber mouth so i could seat the drive band right to the bullets there was not a single issue. anyway, point being which i got way off track, a true bore riding bullet design can use a conventionally dimensioned leade angle with zero throat length which will result in a very long throat life. a bore rider bullet in a +p or Hybrid throat would likely result on even shorter throat life…. [/QUOTE]
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