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Rifles, Reloading, Optics, Equipment
Gunsmithing
Muzzle threading vs barrel diameter
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<blockquote data-quote="IdahoCTD" data-source="post: 1646525" data-attributes="member: 13110"><p>Most people dont realize this but there is only about .005" difference going from 24tpi to 28tpi and .005" difference going from 28tpi to 32tpi. That is the total minor diameter change. Split that in half and that is how much more barrel wall thickness you get. So from 24tpi to 32 tpi it adds roughly .005" per side. IMO that is hardly anything when your talking .150" being a safe minimum of barrel wall thickness. Somehow I doubt 3% more barrel wall thickness is going to save the day on a distorted barrel from over tightening or from ripping that threads off the barrel. Even in the case of 1/2x28 tpi on a .308 barrel if you take the 1/2x28 absolute minimum diameter (.4564" on 2A threads or .4572 for 3A) and subtract .308 that gives you .148/2 or .074" of wall thickness. Going from 28tpi to 32tpi adds roughly .0025 per side or in the neighborhood of 3%. Not a magic pixie dust fix for having to run small thread sizes on a skinny barrel and not worth limiting myself to running only 32tpi brakes IMO.</p></blockquote><p></p>
[QUOTE="IdahoCTD, post: 1646525, member: 13110"] Most people dont realize this but there is only about .005" difference going from 24tpi to 28tpi and .005" difference going from 28tpi to 32tpi. That is the total minor diameter change. Split that in half and that is how much more barrel wall thickness you get. So from 24tpi to 32 tpi it adds roughly .005" per side. IMO that is hardly anything when your talking .150" being a safe minimum of barrel wall thickness. Somehow I doubt 3% more barrel wall thickness is going to save the day on a distorted barrel from over tightening or from ripping that threads off the barrel. Even in the case of 1/2x28 tpi on a .308 barrel if you take the 1/2x28 absolute minimum diameter (.4564" on 2A threads or .4572 for 3A) and subtract .308 that gives you .148/2 or .074" of wall thickness. Going from 28tpi to 32tpi adds roughly .0025 per side or in the neighborhood of 3%. Not a magic pixie dust fix for having to run small thread sizes on a skinny barrel and not worth limiting myself to running only 32tpi brakes IMO. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
Muzzle threading vs barrel diameter
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