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Rifles, Reloading, Optics, Equipment
Gunsmithing
barrel threading question
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<blockquote data-quote="tobnpr" data-source="post: 2669251" data-attributes="member: 68758"><p>That's just "my" standard. You'll find other smiths may feel differently, on any number of these types of standards- minimum shoulders for brakes and suppressors, barrel wall thickness are just examples. With .050-.060 barrel wall the muzzle isn't going to self destruct- but there are very real potential accuracy issues when you get too skinny. Chad at LRI explains it on his website if you're not familiar with this:</p><p></p><p><strong>Last, the caliber and cartridge for a particular setup must be considered. As a rule, LRI requires a minimum of .100" of wall thickness between the groove diameter of the barrel and the root diameter of the thread being machined to the muzzle. This value is judgement-based as well. A 300-378 Weatherby Magnum is a powerful cartridge with muzzle pressures significantly higher than a 308 Winchester at a given barrel length. Wall thickness should be increased accordingly.</strong></p><p><strong></strong></p><p><strong>Our experience has shown that a thin wall muzzle has the potential to "bell mouth" over time. When a crown bell mouths, the accuracy of the rifle suffers. You as the user may be compelled to think the barrel "let go" due to throat erosion when it's actually because the muzzle was threaded with too thin of a wall thickness.</strong></p></blockquote><p></p>
[QUOTE="tobnpr, post: 2669251, member: 68758"] That's just "my" standard. You'll find other smiths may feel differently, on any number of these types of standards- minimum shoulders for brakes and suppressors, barrel wall thickness are just examples. With .050-.060 barrel wall the muzzle isn't going to self destruct- but there are very real potential accuracy issues when you get too skinny. Chad at LRI explains it on his website if you're not familiar with this: [B]Last, the caliber and cartridge for a particular setup must be considered. As a rule, LRI requires a minimum of .100" of wall thickness between the groove diameter of the barrel and the root diameter of the thread being machined to the muzzle. This value is judgement-based as well. A 300-378 Weatherby Magnum is a powerful cartridge with muzzle pressures significantly higher than a 308 Winchester at a given barrel length. Wall thickness should be increased accordingly. Our experience has shown that a thin wall muzzle has the potential to "bell mouth" over time. When a crown bell mouths, the accuracy of the rifle suffers. You as the user may be compelled to think the barrel "let go" due to throat erosion when it's actually because the muzzle was threaded with too thin of a wall thickness.[/B] [/QUOTE]
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Gunsmithing
barrel threading question
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