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Long Range Hunting & Shooting
6.5 PRC Barrel Questions
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<blockquote data-quote="parshal" data-source="post: 2639662" data-attributes="member: 605"><p>No, there is not a performance reduction. If you shoot near sea level the extra twist will ensure stability. Use Berger's stability calculator to determine if it's stable enough at different altitudes. Velocity is a factor, too.</p><p></p><p>8 twist barrels will work for most everything other than the long bullets at lower elevations. They're also much easier to find than a 7.5.</p><p></p><p><edit> I use the 153.5 in my 6.5 Creedmoor for NRL Hunter. I run it at 2580 'ish. At sea level, stability is marginal in an 8 twist. 7.5 twist is stable. At 3000 fps it's more stable but still on the high end of marginal in an 8 twist. In order to be stable, according to the calculator, I need to be above 2500' elevation. I may shoot matches below 3000' elevation and will be hunting around 4000' in Africa with the 156..</p></blockquote><p></p>
[QUOTE="parshal, post: 2639662, member: 605"] No, there is not a performance reduction. If you shoot near sea level the extra twist will ensure stability. Use Berger's stability calculator to determine if it's stable enough at different altitudes. Velocity is a factor, too. 8 twist barrels will work for most everything other than the long bullets at lower elevations. They're also much easier to find than a 7.5. <edit> I use the 153.5 in my 6.5 Creedmoor for NRL Hunter. I run it at 2580 'ish. At sea level, stability is marginal in an 8 twist. 7.5 twist is stable. At 3000 fps it's more stable but still on the high end of marginal in an 8 twist. In order to be stable, according to the calculator, I need to be above 2500' elevation. I may shoot matches below 3000' elevation and will be hunting around 4000' in Africa with the 156.. [/QUOTE]
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