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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity:How much ?
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<blockquote data-quote="Moman" data-source="post: 360219" data-attributes="member: 10494"><p>#1: I think when most guys state, including myself, that we FL new brass is not necessarily doing a complete FL size on it. It's simply to run new brass through a die and straighten up the case mouths. Whether I am using Lapua, Norma, or Nosler, they have all improved by running through a die for this purpose. In most cases, the shoulders aren't being touched until fireformed. </p><p> </p><p>#2: Not every gun has a completely true chamber and some do contribute to concentricity issues. So if you were to fireform all of your brass before doing any measuring, it could also be misleading.</p><p> </p><p>With some calibers it is hard to fireform every piece of brass before putting the gauges to it. The 300 RUM is a prime example. There is only so much life in most barrels of this and other calibers.</p><p> </p><p>I agree with you though on the runout gauge. I know we talked quite a bit before regarding concentricity vs runout, and TIR does seem to be a more accurate way to determine this.</p><p> </p><p>Mikecr, some of this is a little on the newer side to me, and some of it's not. But, maybe this could help to answer the "why on earth would you do that" question.</p></blockquote><p></p>
[QUOTE="Moman, post: 360219, member: 10494"] #1: I think when most guys state, including myself, that we FL new brass is not necessarily doing a complete FL size on it. It's simply to run new brass through a die and straighten up the case mouths. Whether I am using Lapua, Norma, or Nosler, they have all improved by running through a die for this purpose. In most cases, the shoulders aren't being touched until fireformed. #2: Not every gun has a completely true chamber and some do contribute to concentricity issues. So if you were to fireform all of your brass before doing any measuring, it could also be misleading. With some calibers it is hard to fireform every piece of brass before putting the gauges to it. The 300 RUM is a prime example. There is only so much life in most barrels of this and other calibers. I agree with you though on the runout gauge. I know we talked quite a bit before regarding concentricity vs runout, and TIR does seem to be a more accurate way to determine this. Mikecr, some of this is a little on the newer side to me, and some of it's not. But, maybe this could help to answer the "why on earth would you do that" question. [/QUOTE]
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Concentricity:How much ?
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