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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
270 WBY Mag to ?
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<blockquote data-quote="Trickymissfit" data-source="post: 528696" data-attributes="member: 25383"><p>Long range wise I'd pick it. But if your thinking 600 yards or less the .257 will get it done. The problem with the .257 bore is the complete lack of good bullets, and the well known fact that the .257 WBY mag is way overbore. With that case it takes about 140 grains or heavier to really see a lot of difference. The 140 grain bullet in the 270 mag will go almost as fast as the 115 grain bullet in the .257, and that ought to tell us all something. The 150 grain bullet in the 7mm mag is only about 150 fps slower with much better ballistics. A 117 grain Hornaday SST has about .390B/C while the 162 grain Hornaday has a .550B/C at about 200fps slower velocity. My charts don't list a 3200fps with a .55B/C, so I used a .54B/C at 3100fps. That's not even close! </p><p> </p><p>.257 @ 3300fps = 1164 ft.lb. with 24.6" of drop using a 300 yard zero</p><p> </p><p>7mm @ 3100fps = 1825 ft.lb. with 24.4" of drop with a 300 yard zero</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 528696, member: 25383"] Long range wise I'd pick it. But if your thinking 600 yards or less the .257 will get it done. The problem with the .257 bore is the complete lack of good bullets, and the well known fact that the .257 WBY mag is way overbore. With that case it takes about 140 grains or heavier to really see a lot of difference. The 140 grain bullet in the 270 mag will go almost as fast as the 115 grain bullet in the .257, and that ought to tell us all something. The 150 grain bullet in the 7mm mag is only about 150 fps slower with much better ballistics. A 117 grain Hornaday SST has about .390B/C while the 162 grain Hornaday has a .550B/C at about 200fps slower velocity. My charts don't list a 3200fps with a .55B/C, so I used a .54B/C at 3100fps. That's not even close! .257 @ 3300fps = 1164 ft.lb. with 24.6" of drop using a 300 yard zero 7mm @ 3100fps = 1825 ft.lb. with 24.4" of drop with a 300 yard zero gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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270 WBY Mag to ?
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