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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
223 bullet weight question for 24" barrel
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<blockquote data-quote="benchracer" data-source="post: 1078169" data-attributes="member: 22069"><p>A 9 twist is a good compromise twist in .223. My 9 twist .223 has shot bullets down to 45 grains (the lightest I have used) very well. At the upper end, it stabilizes the 75 AMAX (the heaviest bullet I have used) and the Hornady 75 BTHP.</p><p> </p><p>From reading some of the things Bryan Litz has written, however, I have learned that it is possible for a bullet to be stable enough to shoot good groups from a given rifle and twist combination, but the bc can still be degraded by insufficient twist.</p><p> </p><p>The Berger bullets website includes a twist calculator, based on Bryan Litz's testing, that will help you to determine whether or not a given bullet can reach its full potential from a given twist. For example, when I input the data for the Hornady 75 BTHP, the Berger twist calculator indicated this bullet to be fully stable from my 9 twist barrel. By contrast, though the 75 AMAX is sufficiently stable to fly straight and shoot decent groups, it was shown to be insufficiently stable from a 9 twist to take full advantage of its bc. Moreover, its bc was degraded to the point where the AMAX offers no ballistic advantage over the BTHP in my rifle.</p></blockquote><p></p>
[QUOTE="benchracer, post: 1078169, member: 22069"] A 9 twist is a good compromise twist in .223. My 9 twist .223 has shot bullets down to 45 grains (the lightest I have used) very well. At the upper end, it stabilizes the 75 AMAX (the heaviest bullet I have used) and the Hornady 75 BTHP. From reading some of the things Bryan Litz has written, however, I have learned that it is possible for a bullet to be stable enough to shoot good groups from a given rifle and twist combination, but the bc can still be degraded by insufficient twist. The Berger bullets website includes a twist calculator, based on Bryan Litz's testing, that will help you to determine whether or not a given bullet can reach its full potential from a given twist. For example, when I input the data for the Hornady 75 BTHP, the Berger twist calculator indicated this bullet to be fully stable from my 9 twist barrel. By contrast, though the 75 AMAX is sufficiently stable to fly straight and shoot decent groups, it was shown to be insufficiently stable from a 9 twist to take full advantage of its bc. Moreover, its bc was degraded to the point where the AMAX offers no ballistic advantage over the BTHP in my rifle. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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223 bullet weight question for 24" barrel
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