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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
true bc of barnes 180 tsx?
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<blockquote data-quote="Fiftydriver" data-source="post: 35378" data-attributes="member: 10"><p>Chris Matthews,</p><p></p><p>I agree with your comments but you also need to realize that not all bullets will decrease in B.C. as they slow in velocity at longer ranges.</p><p></p><p>Some will vary very little and others will actually have the B.C. increase at lower velocities,</p><p></p><p>For example, selecting out of your own reference, the Sierra Manual, lets look at a few different bullets:</p><p></p><p>Most semi-spitzers will actually increase in B.C. as their velocity drops, some of these are:</p><p></p><p>.224" 40 gr Hornet</p><p>.224" 40 gr HP</p><p>.224" 45 gr Hornet</p><p>.224" 55 gr Semi-Point</p><p>.224" 55 gr HPBT</p><p>.224" 69 gr HPBT MK</p><p></p><p>Most light for caliber HP bullets will behave this way as well.</p><p></p><p>Many bullets stay basically the same such as:</p><p></p><p>.257" 90 gr HPBT</p><p>.264" 120 gr HPBT MK</p><p>.284" 168 gr HPBT MK</p><p></p><p>And many more. YOu can not say that your B.C. will decrease with less velocity as it will often increase and just as often stay the same for all practical purposes.</p><p></p><p>The only way to know for sure is field testing at the varying ranges.</p><p></p><p>Good Shooting!!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 35378, member: 10"] Chris Matthews, I agree with your comments but you also need to realize that not all bullets will decrease in B.C. as they slow in velocity at longer ranges. Some will vary very little and others will actually have the B.C. increase at lower velocities, For example, selecting out of your own reference, the Sierra Manual, lets look at a few different bullets: Most semi-spitzers will actually increase in B.C. as their velocity drops, some of these are: .224" 40 gr Hornet .224" 40 gr HP .224" 45 gr Hornet .224" 55 gr Semi-Point .224" 55 gr HPBT .224" 69 gr HPBT MK Most light for caliber HP bullets will behave this way as well. Many bullets stay basically the same such as: .257" 90 gr HPBT .264" 120 gr HPBT MK .284" 168 gr HPBT MK And many more. YOu can not say that your B.C. will decrease with less velocity as it will often increase and just as often stay the same for all practical purposes. The only way to know for sure is field testing at the varying ranges. Good Shooting!!! Kirby Allen(50) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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true bc of barnes 180 tsx?
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