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The Water Cooler
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AR Styles/Calibers
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<blockquote data-quote="D.M." data-source="post: 3153376" data-attributes="member: 42678"><p>Most AR-15's come with a 1/9 twist bbl. Some of these will shoot with heavy bullets like the 77's but </p><p>most will not. If you handload you can get up to 80gr from Sierra or Nosler. I think Berger makes a 90.</p><p>The heavy bullets are best shot through a 1/7 or 1/8 twist. If you get a 1/9 twist and it don't like the 77's</p><p>then go with Hornaday 75's they are made with the 1/9 twist in mind. The Hornaday 75's are available in</p><p>factory ammo, and in the right rifle are capable of holding the black at 500. One problem with the ultra </p><p>heavy bullets (80gr & up) is they must be seated so deep in the case to fit in the mag it eats up a lot of </p><p>powder space. That's why you don't see them in factory loadings. Hope this helps. If you want to try the </p><p>Hornady 75's, you can find them at SGAmmo or at the CMP.</p></blockquote><p></p>
[QUOTE="D.M., post: 3153376, member: 42678"] Most AR-15's come with a 1/9 twist bbl. Some of these will shoot with heavy bullets like the 77's but most will not. If you handload you can get up to 80gr from Sierra or Nosler. I think Berger makes a 90. The heavy bullets are best shot through a 1/7 or 1/8 twist. If you get a 1/9 twist and it don't like the 77's then go with Hornaday 75's they are made with the 1/9 twist in mind. The Hornaday 75's are available in factory ammo, and in the right rifle are capable of holding the black at 500. One problem with the ultra heavy bullets (80gr & up) is they must be seated so deep in the case to fit in the mag it eats up a lot of powder space. That's why you don't see them in factory loadings. Hope this helps. If you want to try the Hornady 75's, you can find them at SGAmmo or at the CMP. [/QUOTE]
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