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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
wind drift based on drag
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<blockquote data-quote="ajhardle" data-source="post: 665470" data-attributes="member: 49861"><p>I hope there are some ballistic geeks who can help me out. After reading Applied Ballistics for Long-Range Shooting by Bryan Litz, I came to the conclusion that necking down a cartridge while using a bullet with a similar form factor, and KE, produces less wind drift. Two reasons that i can think of are- #1 the lag time is reduced from compressesing the time flight through higher velocity, and #2 the Cd is lower at a higher velocity. After reveiwing alot of numbers, i realize there is more going on because the smaller bullet has a greater advantage than i assumed. There is no mention of this in the book. can someone enlighten me? ( to keep things simple let's assume a 230 gr .308 and a 140 gr. .264 with i7 of 1 and 3096 ft-lbs at the muzzle, the equivalent of a 155 gr. .308 @ 3000 fps. Sd and g7 bc are .287 and .346.)</p></blockquote><p></p>
[QUOTE="ajhardle, post: 665470, member: 49861"] I hope there are some ballistic geeks who can help me out. After reading Applied Ballistics for Long-Range Shooting by Bryan Litz, I came to the conclusion that necking down a cartridge while using a bullet with a similar form factor, and KE, produces less wind drift. Two reasons that i can think of are- #1 the lag time is reduced from compressesing the time flight through higher velocity, and #2 the Cd is lower at a higher velocity. After reveiwing alot of numbers, i realize there is more going on because the smaller bullet has a greater advantage than i assumed. There is no mention of this in the book. can someone enlighten me? ( to keep things simple let's assume a 230 gr .308 and a 140 gr. .264 with i7 of 1 and 3096 ft-lbs at the muzzle, the equivalent of a 155 gr. .308 @ 3000 fps. Sd and g7 bc are .287 and .346.) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
wind drift based on drag
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