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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Drag Function question.
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<blockquote data-quote="TiroFijo" data-source="post: 32231" data-attributes="member: 974"><p>"VLD bullets use a G7 drag model</p><p>Flat Base Spire Points use a G6 drag model</p><p>Boat tail bullets use a G5 drag model</p><p>SMK? I'm guessing is a Sierra Match King, which is a boat tail bullets"</p><p></p><p>Not always, and remember most bullets don't match any drag function perfectly.</p><p></p><p>According to Sierra, after extensive tests the G1 function is the one that fits most of their bullets best (even some of those sleek SMK HPBT bullets).</p><p>Since no bullet will correspond exactly with a given drag function, their Infinity program uses the G1 function with a different BC at different velocity ranges.</p><p>For example their data with the 190 SMK is:</p><p>.533 avove 2100 fps</p><p>.525 at 2100&lt; vel &gt;1600</p><p>and .515 below 1600</p><p>This is only a 3.4% variation, obviously a very good fit.</p></blockquote><p></p>
[QUOTE="TiroFijo, post: 32231, member: 974"] "VLD bullets use a G7 drag model Flat Base Spire Points use a G6 drag model Boat tail bullets use a G5 drag model SMK? I'm guessing is a Sierra Match King, which is a boat tail bullets" Not always, and remember most bullets don't match any drag function perfectly. According to Sierra, after extensive tests the G1 function is the one that fits most of their bullets best (even some of those sleek SMK HPBT bullets). Since no bullet will correspond exactly with a given drag function, their Infinity program uses the G1 function with a different BC at different velocity ranges. For example their data with the 190 SMK is: .533 avove 2100 fps .525 at 2100< vel >1600 and .515 below 1600 This is only a 3.4% variation, obviously a very good fit. [/QUOTE]
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Drag Function question.
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