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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bartlein gain twist barrel
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<blockquote data-quote="tim_w" data-source="post: 1463012" data-attributes="member: 11132"><p>Its not the vel of the bullet or its RPMs in the barrel that is the issue but the force behind the bullet itself forcing it to be engraved. By starting with the slowest twist rate at the throat you where the highest pressure and thus force against the bullet. This is also where the bullet is initially being engraved thus its the point of maximum stress on the jacket. As the bullet travels down it is only very marginally having new displaced jacket material by what is actually a very small increase in angle which based on reported accuracy capable of these barrels is not negatively hurting it. You also do get the benefit of possible better seal etc. that has been mentioned.</p><p></p><p>Proof of the decreased stress on the jackets can be seen where the gain twist are able to run vel that barrels with straight twist of the ending twist rate bullets were coming apart. </p><p></p><p>Do not forget that many of the best barrels manf have added a small amount of increase in twist and tighten up as they reach the muzzle. Rock as an example has been doing this for a very long time. This is just a to a larger degree.</p><p></p><p>Personally I think the limit for conventional setups is about a 1" gain.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1463012, member: 11132"] Its not the vel of the bullet or its RPMs in the barrel that is the issue but the force behind the bullet itself forcing it to be engraved. By starting with the slowest twist rate at the throat you where the highest pressure and thus force against the bullet. This is also where the bullet is initially being engraved thus its the point of maximum stress on the jacket. As the bullet travels down it is only very marginally having new displaced jacket material by what is actually a very small increase in angle which based on reported accuracy capable of these barrels is not negatively hurting it. You also do get the benefit of possible better seal etc. that has been mentioned. Proof of the decreased stress on the jackets can be seen where the gain twist are able to run vel that barrels with straight twist of the ending twist rate bullets were coming apart. Do not forget that many of the best barrels manf have added a small amount of increase in twist and tighten up as they reach the muzzle. Rock as an example has been doing this for a very long time. This is just a to a larger degree. Personally I think the limit for conventional setups is about a 1" gain. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Bartlein gain twist barrel
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