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What's Wrong With .30 Caliber? By Bryan Litz
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<blockquote data-quote="BryanLitz" data-source="post: 262101" data-attributes="member: 7848"><p>Yes.</p><p></p><p>It's also commonly believed that polymer tips increase BC significantly because they're pointier and not blunt like a typical open tip bullet. They do have a little less drag, but it's not a big difference.</p><p>Ballistic Tips actually have higher drag than other bullets of similar weight and caliber because they lack an effective boat-tail. The boat-tail on many of the Vmax and Amax bullets are usually very steep as well, which hurts their effectiveness at reducing base drag. So ironically, many of the bullets with polymer tips which are thought to have higher BC's due to the tips, actually have lower BC's because of poor boat-tails.</p><p>The heavier Amax's (105 gr 6mm, 140 gr 6.5mm, 162 7mm, 208 .30 cal) are exceptions. They all have very good boat tails and are among the lowest drag bullets made.</p><p>The 117 grain 6mm DTAC bullets were also well designed, but I don't think they're being made anymore.</p><p></p><p>-Bryan</p></blockquote><p></p>
[QUOTE="BryanLitz, post: 262101, member: 7848"] Yes. It's also commonly believed that polymer tips increase BC significantly because they're pointier and not blunt like a typical open tip bullet. They do have a little less drag, but it's not a big difference. Ballistic Tips actually have higher drag than other bullets of similar weight and caliber because they lack an effective boat-tail. The boat-tail on many of the Vmax and Amax bullets are usually very steep as well, which hurts their effectiveness at reducing base drag. So ironically, many of the bullets with polymer tips which are thought to have higher BC's due to the tips, actually have lower BC's because of poor boat-tails. The heavier Amax's (105 gr 6mm, 140 gr 6.5mm, 162 7mm, 208 .30 cal) are exceptions. They all have very good boat tails and are among the lowest drag bullets made. The 117 grain 6mm DTAC bullets were also well designed, but I don't think they're being made anymore. -Bryan [/QUOTE]
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What's Wrong With .30 Caliber? By Bryan Litz
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