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Rifles, Reloading, Optics, Equipment
Reloading
true freebore
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<blockquote data-quote="ballistx" data-source="post: 929187" data-attributes="member: 32156"><p>That is the way that I catalog the bullets. I use .002 below the base diameter as the reference for the ogive.</p><p> </p><p>The "cartridge freebore" is my working freebore. That is what the cartridge actually sees. There is no support between the end of the case and the beginning of the bore. That includes the distance from the front of my case to the chamber end of the case. In the 30-06, that is my case length of 2.494" (or thereabouts) and the SAAMI of 2.5228" (not the actual for that chamber though).</p><p> </p><p>On my 243 loads with the Nosler SHOTS 55 grain bullets, I have the bullet set with the ogive at the face of the neck. There is NO bullet shank exposed at all. That means that the bullet "jump" is truly from the front of my case to the lands. It is supported only by the case neck (roughly), the chamber neck area (more loosely), then the chamber or rifle freebore for 0.204" and then the actual or excess freebore beyond the SAAMI specifications. Gets to be quite a distance. Then when you figure the bullet is jammed ahead by the firing pin, then stops, then pushed forward some more when the primer ignites, then pushed harder as the powder ignites, it gets to be a rough ride for that little feller.</p><p> </p><p>None of this can really be quantified until you have specific data points and specific names for those data points. Most are well clarified. Freebore happened to be one that has a number of meanings to different people. I am basing my definition on what it appears the reamer manufacturers are defining it as.</p><p> </p><p>Again, just my engineering OCD.</p></blockquote><p></p>
[QUOTE="ballistx, post: 929187, member: 32156"] That is the way that I catalog the bullets. I use .002 below the base diameter as the reference for the ogive. The "cartridge freebore" is my working freebore. That is what the cartridge actually sees. There is no support between the end of the case and the beginning of the bore. That includes the distance from the front of my case to the chamber end of the case. In the 30-06, that is my case length of 2.494" (or thereabouts) and the SAAMI of 2.5228" (not the actual for that chamber though). On my 243 loads with the Nosler SHOTS 55 grain bullets, I have the bullet set with the ogive at the face of the neck. There is NO bullet shank exposed at all. That means that the bullet "jump" is truly from the front of my case to the lands. It is supported only by the case neck (roughly), the chamber neck area (more loosely), then the chamber or rifle freebore for 0.204" and then the actual or excess freebore beyond the SAAMI specifications. Gets to be quite a distance. Then when you figure the bullet is jammed ahead by the firing pin, then stops, then pushed forward some more when the primer ignites, then pushed harder as the powder ignites, it gets to be a rough ride for that little feller. None of this can really be quantified until you have specific data points and specific names for those data points. Most are well clarified. Freebore happened to be one that has a number of meanings to different people. I am basing my definition on what it appears the reamer manufacturers are defining it as. Again, just my engineering OCD. [/QUOTE]
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true freebore
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