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Gain twist
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<blockquote data-quote="tacomHQ" data-source="post: 2605214" data-attributes="member: 67159"><p>Actually it seems I read about the gain twist being used by the Germans in WWll. Pretty radical values also. </p><p>We have been working with Bartlein on non-standard gains - and to date for great success. Two major reason: first being initial pressure. Screw threads take force. The tighter the thread the greater the force to move an object down the thread. The other reason... maybe later. The minors are a goal of increased velocity, spread the initial pressure pulse over a longer distance, reducing pressure equals less temperature, longer throat life... to name a few. </p><p>We built a pair of .460's - identical except for the gain values. One was 1.5tgain the other a 4t gain. The gun with the 4t gain can runs +5gr grains less powder for +70fps on the same round with less felt recoil. Our 300WM runs 12-8 on the twist.. a bit more non-standard features are being added to that barrel and will shortly put rounds down that tube. Accuracy wise the .460's have documented 1.25" three shot groups at 600yds. Perhaps not 6mm territory but recoil control of a 6mm Dasher as compared to a .460 shooting a 635gr Badlands bullet at 3070fps...</p></blockquote><p></p>
[QUOTE="tacomHQ, post: 2605214, member: 67159"] Actually it seems I read about the gain twist being used by the Germans in WWll. Pretty radical values also. We have been working with Bartlein on non-standard gains - and to date for great success. Two major reason: first being initial pressure. Screw threads take force. The tighter the thread the greater the force to move an object down the thread. The other reason... maybe later. The minors are a goal of increased velocity, spread the initial pressure pulse over a longer distance, reducing pressure equals less temperature, longer throat life... to name a few. We built a pair of .460's - identical except for the gain values. One was 1.5tgain the other a 4t gain. The gun with the 4t gain can runs +5gr grains less powder for +70fps on the same round with less felt recoil. Our 300WM runs 12-8 on the twist.. a bit more non-standard features are being added to that barrel and will shortly put rounds down that tube. Accuracy wise the .460's have documented 1.25" three shot groups at 600yds. Perhaps not 6mm territory but recoil control of a 6mm Dasher as compared to a .460 shooting a 635gr Badlands bullet at 3070fps... [/QUOTE]
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