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Hunting
Long Range Hunting & Shooting
PRC twist rate 7,7.5,8?
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<blockquote data-quote="lancetkenyon" data-source="post: 1690512" data-attributes="member: 68875"><p>With sea level and up, and running a 147, and possibly moving up, I would go 1:7.5" at least.</p><p> </p><p>The new 156 Berger Elite says "minimum 1:8" twist....but that is not the "optimal" twist rate. Run the numbers.</p><p>If you can get them to 3020fps, even at 30°F and sea level, you are still at 1.58SG. Fully stable, albeit not by a ton. Going to a 1:7" would bump SG to 1.82. 1:8" isn't going to cut it.</p><p></p><p>I run a 1:7.5" in my new 6.5SS, and the 156s are shooting phenomenally out of it.</p></blockquote><p></p>
[QUOTE="lancetkenyon, post: 1690512, member: 68875"] With sea level and up, and running a 147, and possibly moving up, I would go 1:7.5" at least. The new 156 Berger Elite says "minimum 1:8" twist....but that is not the "optimal" twist rate. Run the numbers. If you can get them to 3020fps, even at 30°F and sea level, you are still at 1.58SG. Fully stable, albeit not by a ton. Going to a 1:7" would bump SG to 1.82. 1:8" isn't going to cut it. I run a 1:7.5" in my new 6.5SS, and the 156s are shooting phenomenally out of it. [/QUOTE]
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PRC twist rate 7,7.5,8?
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