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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
280 AI replacement for 270 Win.
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<blockquote data-quote="Pdvdh" data-source="post: 291172" data-attributes="member: 4191"><p>Have you shot your 7wsm and 280AI over your chrono in one chronographing event, and your 280AI read 3150fps and your 7wsm read 2950fps? If so, perhaps your chronograph is giving good data/speed. </p><p></p><p>The chronograph is the way to nail down the MV, above and beyond drops. Using drops to establish muzzle velocity involves guesstimation of both MV and BC. You need to establish MV over the chronograph - in my opinion. </p><p></p><p>Maybe you know someone else that will let you shoot over their chrono as a check on yours? What brand chrono are you using? "Never say never", but your 280AI MVs seem on the high side. Look forward to learning of your final determination.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 291172, member: 4191"] Have you shot your 7wsm and 280AI over your chrono in one chronographing event, and your 280AI read 3150fps and your 7wsm read 2950fps? If so, perhaps your chronograph is giving good data/speed. The chronograph is the way to nail down the MV, above and beyond drops. Using drops to establish muzzle velocity involves guesstimation of both MV and BC. You need to establish MV over the chronograph - in my opinion. Maybe you know someone else that will let you shoot over their chrono as a check on yours? What brand chrono are you using? "Never say never", but your 280AI MVs seem on the high side. Look forward to learning of your final determination. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
280 AI replacement for 270 Win.
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