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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5-7mm PRC (Hornady)
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<blockquote data-quote="lancetkenyon" data-source="post: 3003141" data-attributes="member: 68875"><p>BC is BC. Energy will definitely be different on target due to bullet weight, but retained velocity and wind drift would be pretty close between a 6.5mm 156 Elite @ G7 BC .347 and a .308 215 Hyb G7 BC .354. But if you push a 156 @ 3200+fps from a 6.5-7PRC, you are going to have a LOT less recoil than with a cartridge that could push a 215 @ 3200+fps. You are talking .300RUM or .300NMI case size.</p><p></p><p>Retained energy, on the otherhand, definitely goes to the big .308. </p><p></p><p>6500' AMSL & 30°F, 1400yds, 10mph full value wind from 270° (L-R), 10# rifle:</p><p></p><p>.308 245 Hyb @ 2900fps</p><p>477" drop, 75.6" drift, 1849fps, 1876ft/lbs, 1.815sec TOF, recoil energy 49.2lbs</p><p></p><p>.308 215 Hyb @ 3200fps</p><p>417" drop, 83.0" drift, 1873fps, 1675ft/lbs, 1.717sec TOF, recoil energy 43.27 lbs</p><p></p><p>6.5 156 Elite @ 3200fps</p><p>421" drop, 83.3" drift, 1850fps, 1186ft/lbs, 1.727sec TOF, recoil energy 24.4lb</p></blockquote><p></p>
[QUOTE="lancetkenyon, post: 3003141, member: 68875"] BC is BC. Energy will definitely be different on target due to bullet weight, but retained velocity and wind drift would be pretty close between a 6.5mm 156 Elite @ G7 BC .347 and a .308 215 Hyb G7 BC .354. But if you push a 156 @ 3200+fps from a 6.5-7PRC, you are going to have a LOT less recoil than with a cartridge that could push a 215 @ 3200+fps. You are talking .300RUM or .300NMI case size. Retained energy, on the otherhand, definitely goes to the big .308. 6500' AMSL & 30°F, 1400yds, 10mph full value wind from 270° (L-R), 10# rifle: .308 245 Hyb @ 2900fps 477" drop, 75.6" drift, 1849fps, 1876ft/lbs, 1.815sec TOF, recoil energy 49.2lbs .308 215 Hyb @ 3200fps 417" drop, 83.0" drift, 1873fps, 1675ft/lbs, 1.717sec TOF, recoil energy 43.27 lbs 6.5 156 Elite @ 3200fps 421" drop, 83.3" drift, 1850fps, 1186ft/lbs, 1.727sec TOF, recoil energy 24.4lb [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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6.5-7mm PRC (Hornady)
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