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Gain twist
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<blockquote data-quote="Sheldon Root" data-source="post: 2605350" data-attributes="member: 112458"><p>I have a custom in 257 Wby Mag. Barrel was by RKS. Gain is very near 1:16 at start and goes to 1:7.5. Special for</p><p>a 115 grn Barnes or Hornady 117. right out of the box used two rounds to sight in scope and then 3 for grouping. </p><p>3/8" at 100 yds. Velocity at 3750 but dropped it back around 3200 to save on powder and barrel wear. The idea behind the gain is to give the bullet a bit of chance to move before the hard twist at the muzzle. Lessons the </p><p>recoil a bit so pressure is lower on initial powder ignition and movement of the bullet. Have a bore scope and have not seen any abnormal marks. Don't be afraid to try one , they work very well. SR</p></blockquote><p></p>
[QUOTE="Sheldon Root, post: 2605350, member: 112458"] I have a custom in 257 Wby Mag. Barrel was by RKS. Gain is very near 1:16 at start and goes to 1:7.5. Special for a 115 grn Barnes or Hornady 117. right out of the box used two rounds to sight in scope and then 3 for grouping. 3/8" at 100 yds. Velocity at 3750 but dropped it back around 3200 to save on powder and barrel wear. The idea behind the gain is to give the bullet a bit of chance to move before the hard twist at the muzzle. Lessons the recoil a bit so pressure is lower on initial powder ignition and movement of the bullet. Have a bore scope and have not seen any abnormal marks. Don't be afraid to try one , they work very well. SR [/QUOTE]
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