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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity:How much ?
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<blockquote data-quote="Mikecr" data-source="post: 360086" data-attributes="member: 1521"><p>There are two standards going(one too many) currently.</p><p>Total Indicated Runout, and Concentricity.</p><p></p><p>TIR amounts to any and all combined as deviation from straight or true.</p><p>Concentricity amounts to ~1/2 the same -w/resp to a centerline.</p><p></p><p>Concentric ammo might not be staright, but straight ammo is concentric as well.</p><p>So IMO, low TIR should be a reloader's goal.</p><p>The best tool for TIR that I'm aware of is a V-Block/Roller similar to Sinclair's.</p><p>And I assure you, your ammo is not straight until measuring low TIR.</p><p></p><p>There are far too many abstracts affecting accuracy to set any rule of thumb. Your chamber clearances -vs- mine, your bullets, throat, headspace, cartridge diameter and length, seating depths, rifling, leade angle, primers, powder.</p><p>I say take it to diminished returns for your system,, and no further.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 360086, member: 1521"] There are two standards going(one too many) currently. Total Indicated Runout, and Concentricity. TIR amounts to any and all combined as deviation from straight or true. Concentricity amounts to ~1/2 the same -w/resp to a centerline. Concentric ammo might not be staright, but straight ammo is concentric as well. So IMO, low TIR should be a reloader's goal. The best tool for TIR that I'm aware of is a V-Block/Roller similar to Sinclair's. And I assure you, your ammo is not straight until measuring low TIR. There are far too many abstracts affecting accuracy to set any rule of thumb. Your chamber clearances -vs- mine, your bullets, throat, headspace, cartridge diameter and length, seating depths, rifling, leade angle, primers, powder. I say take it to diminished returns for your system,, and no further. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity:How much ?
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