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Effects Of Cartridge Over All Length (COAL) And Cartridge Base To Ogive (CBTO) – Part 2
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<blockquote data-quote="RegionRat" data-source="post: 1059763" data-attributes="member: 57231"><p>Looks like the photo in Figure 5 was supposed to be the Stoney Point gage but was a copy of the bullet comparison.</p><p> </p><p>Very good points on the differences between the reference tooling brass supplied with the Stoney Point versus the actual closed bolt distance. I have been in the habit of running the reference brass of the gage through my other case gages to get a feel of how far from nominal their supplied case measures. Then I compare it to my cycled cases. With a study of that difference, I very carefully construct a dummy round with those estimated offsets and attempt a study of your first method until I think I have verified the contact with the lands is real and not in my imagination. Access to a good stereo-microscope helps with the examination of the bullet, but tool room layout ink or magic marker works too.</p><p> </p><p>Shallow reamer angles can make the contact points more or less difficult to determine. Based on the differences between reamer angles, do you have a favorite angle dimension? Say for .30 cal or .224, would you assume the same?</p></blockquote><p></p>
[QUOTE="RegionRat, post: 1059763, member: 57231"] Looks like the photo in Figure 5 was supposed to be the Stoney Point gage but was a copy of the bullet comparison. Very good points on the differences between the reference tooling brass supplied with the Stoney Point versus the actual closed bolt distance. I have been in the habit of running the reference brass of the gage through my other case gages to get a feel of how far from nominal their supplied case measures. Then I compare it to my cycled cases. With a study of that difference, I very carefully construct a dummy round with those estimated offsets and attempt a study of your first method until I think I have verified the contact with the lands is real and not in my imagination. Access to a good stereo-microscope helps with the examination of the bullet, but tool room layout ink or magic marker works too. Shallow reamer angles can make the contact points more or less difficult to determine. Based on the differences between reamer angles, do you have a favorite angle dimension? Say for .30 cal or .224, would you assume the same? [/QUOTE]
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Effects Of Cartridge Over All Length (COAL) And Cartridge Base To Ogive (CBTO) – Part 2
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