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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5 PRC 156gr Berger EOL twist dilemma
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<blockquote data-quote="tacomHQ" data-source="post: 2958441" data-attributes="member: 67159"><p>Not necessarily applicable in this situation but very real.</p><p>Given the same twist rates:</p><p>We have found that Barrel MfrA can shoot Bullet MfrA but cannot shoot Bullet MfrB- as in won't stabilize.</p><p>But Barrel Mfr B can shoot Bullet MfrB but cannot shoot Bullet Mfr A. In some cases keyholes and or missed targets at 100yds.</p><p>This has been seen on multiple Barrel Mfg's and multiple Bullet Mfg's.</p><p>Solids are more susceptible - to date- to this phenomena. </p><p>We have seen this, repeating, phenomena even when twist rates are well within mfg's specs and meet stability specs.</p><p>While this is seen with solids predominately- barrels that could not shoot a specific solid bullet could all shoot copper/lead bullets. As in stabilized and not key holes.</p><p>NOTE: this will have to be further proven over "time" and standard tool changes at the Barrel Mfg to determine root cause. </p><p></p><p>Gain twist - in our experience - do reduce initial pressure values, bolt set back and initial felt recoil. We run single digit gains such as Bartlein to large 4+Twist gains using K.S. Arms Ltd . We have done this on 6mm to 460 cals.. We actually tested consecutive 460 barrels one with a 1GT and the other with a 4GT. Coincidentally in this test the 4GT had higher velocity per powder charge, could run a higher powder charge and had less felt recoil. </p><p>All of our shop guns now run the large gain twist... Another significant attribute does exist, potentially the most important attribute, but we are continuing testing to see what the downsides are.</p></blockquote><p></p>
[QUOTE="tacomHQ, post: 2958441, member: 67159"] Not necessarily applicable in this situation but very real. Given the same twist rates: We have found that Barrel MfrA can shoot Bullet MfrA but cannot shoot Bullet MfrB- as in won't stabilize. But Barrel Mfr B can shoot Bullet MfrB but cannot shoot Bullet Mfr A. In some cases keyholes and or missed targets at 100yds. This has been seen on multiple Barrel Mfg's and multiple Bullet Mfg's. Solids are more susceptible - to date- to this phenomena. We have seen this, repeating, phenomena even when twist rates are well within mfg's specs and meet stability specs. While this is seen with solids predominately- barrels that could not shoot a specific solid bullet could all shoot copper/lead bullets. As in stabilized and not key holes. NOTE: this will have to be further proven over "time" and standard tool changes at the Barrel Mfg to determine root cause. Gain twist - in our experience - do reduce initial pressure values, bolt set back and initial felt recoil. We run single digit gains such as Bartlein to large 4+Twist gains using K.S. Arms Ltd . We have done this on 6mm to 460 cals.. We actually tested consecutive 460 barrels one with a 1GT and the other with a 4GT. Coincidentally in this test the 4GT had higher velocity per powder charge, could run a higher powder charge and had less felt recoil. All of our shop guns now run the large gain twist... Another significant attribute does exist, potentially the most important attribute, but we are continuing testing to see what the downsides are. [/QUOTE]
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6.5 PRC 156gr Berger EOL twist dilemma
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