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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet Spin and Performance
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<blockquote data-quote="Lightvarmint" data-source="post: 248571"><p>Kirby,</p><p></p><p>Expansion is somewhat dependent on bullet spin as per your above post. It must be properly stabilized to travel straight and therefore to impact properly on the bullet tip and cause proper deformation and expansion. Non stable bullets sometimes make right and left hand turns and do not expand because they do not impact properly upon the tip to cause expansion..</p><p></p><p>GS Custom bullets of South Africa design their bullets to "lose" the petals and become a flat nose bullet upon penetration of the media that it is shot into.</p><p></p><p>You can take a full metal jacket bullet and make it behave like the GS bullets just by "adjusting" the tip with a serrator. Furthermore, you can take an unformed bullet with a heavy jacket with just the core seated and perform an internal serration process and use the same bullet profile for say a 338 Allen Magnum or even as slow as a 338 Federal and get proper performance out of each one using the same bullet die..... Basically, they do not have to be the same on the inside to be the same profile on the outside and perform properly at the extremes on the velocity scale. Just think of it two or more levels of performance using the same heavier jackets, core, and tip for different starting velocities........... Heavier jackets tend to behave more like bonded bullets without the hassle of the chemical process.....</p><p></p><p>So, for the pistoleros, you can even have the same high BC bullets that are set up for HV out of a big rifles and use the exact same bullet (adjusted) in the smaller cased pistols and still get good performance out of both...... Just like Kirby said, all it has to do is to survive the launch and, that is easily adjusted by experienced bulletsmiths.....</p><p></p><p>Questions of the Day:</p><p></p><p>Additionally, how does the number of engravings by the lands in the barrel affect both accuracy and expansion performance of hunting bullets?</p><p></p><p>Lightvarmint</p></blockquote><p></p>
[QUOTE="Lightvarmint, post: 248571"] Kirby, Expansion is somewhat dependent on bullet spin as per your above post. It must be properly stabilized to travel straight and therefore to impact properly on the bullet tip and cause proper deformation and expansion. Non stable bullets sometimes make right and left hand turns and do not expand because they do not impact properly upon the tip to cause expansion.. GS Custom bullets of South Africa design their bullets to "lose" the petals and become a flat nose bullet upon penetration of the media that it is shot into. You can take a full metal jacket bullet and make it behave like the GS bullets just by "adjusting" the tip with a serrator. Furthermore, you can take an unformed bullet with a heavy jacket with just the core seated and perform an internal serration process and use the same bullet profile for say a 338 Allen Magnum or even as slow as a 338 Federal and get proper performance out of each one using the same bullet die..... Basically, they do not have to be the same on the inside to be the same profile on the outside and perform properly at the extremes on the velocity scale. Just think of it two or more levels of performance using the same heavier jackets, core, and tip for different starting velocities........... Heavier jackets tend to behave more like bonded bullets without the hassle of the chemical process..... So, for the pistoleros, you can even have the same high BC bullets that are set up for HV out of a big rifles and use the exact same bullet (adjusted) in the smaller cased pistols and still get good performance out of both...... Just like Kirby said, all it has to do is to survive the launch and, that is easily adjusted by experienced bulletsmiths..... Questions of the Day: Additionally, how does the number of engravings by the lands in the barrel affect both accuracy and expansion performance of hunting bullets? Lightvarmint [/QUOTE]
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