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Long Range Hunting & Shooting
What would cause this? Bullet drop with elevation change
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<blockquote data-quote="Hugnot" data-source="post: 2046001" data-attributes="member: 115658"><p>These Boeing engineers that I 1nze shot with got into this stuff and claimed the grooves turned into bullets sort of liked disrupted that "thin film of fluid (air in this case) stays stuck to a surface of an object" and thus increased the ballistic abilities of the projectile.</p><p></p><p>So I got some .257 diameter,100 grain Nosler partition bullets having the turned grooves and compared them at 600 yards with .257 100 gr. Sierra spitzer (lead point) flat base hunting bullets that I shot deers with. Essentially, same results out of a .257 AI @ 3150 fps. It was suggested that an velocity increase might make a difference so things were done again with a .257 Weatherby. No diff, and then the argument was that the 12 twist Weatherby shooting the slightly longer .25 100 grain Nosler bullet acquired some stability deficits compared to the shorter 100 gr. Sierra.</p><p></p><p>The talk got into Reynolds Numbers, like turbulent flow as opposed to laminar flow. Being a "cook book" math guy this was over my head. My thinking was that some energy was needed to make the turbulent flow occur and that energy would act to slow down the bullet.</p><p></p><p>I then got into pointy 6mm boat tail bullets. Don't think this stuff would have much application to the OP's problem.</p><p></p><p>Edit: shooting competition at different ranges having different elevations, and some differences of elevation angles, usual temperature differences & other stuff made my range notes real valuable.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2046001, member: 115658"] These Boeing engineers that I 1nze shot with got into this stuff and claimed the grooves turned into bullets sort of liked disrupted that "thin film of fluid (air in this case) stays stuck to a surface of an object" and thus increased the ballistic abilities of the projectile. So I got some .257 diameter,100 grain Nosler partition bullets having the turned grooves and compared them at 600 yards with .257 100 gr. Sierra spitzer (lead point) flat base hunting bullets that I shot deers with. Essentially, same results out of a .257 AI @ 3150 fps. It was suggested that an velocity increase might make a difference so things were done again with a .257 Weatherby. No diff, and then the argument was that the 12 twist Weatherby shooting the slightly longer .25 100 grain Nosler bullet acquired some stability deficits compared to the shorter 100 gr. Sierra. The talk got into Reynolds Numbers, like turbulent flow as opposed to laminar flow. Being a "cook book" math guy this was over my head. My thinking was that some energy was needed to make the turbulent flow occur and that energy would act to slow down the bullet. I then got into pointy 6mm boat tail bullets. Don't think this stuff would have much application to the OP's problem. Edit: shooting competition at different ranges having different elevations, and some differences of elevation angles, usual temperature differences & other stuff made my range notes real valuable. [/QUOTE]
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What would cause this? Bullet drop with elevation change
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