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Rifles, Reloading, Optics, Equipment
Reloading
300 Win Mag Build and Loading Questions.
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<blockquote data-quote="Bart B" data-source="post: 1148985" data-attributes="member: 5302"><p>As far as I know, no cartridge spinning tool holds bottleneck cases (headspacing on their shoulder) to measure bullet runout the same way they are held in the chamber when fired. Depending on which one of these different ways the round is supported, you'll get different readings.</p><p></p><p>Two point support:</p><p></p><p>* Pressure ring and right behind bullet tip.</p><p></p><p>* Pressure ring and bullet right in front of the case mouth.</p><p></p><p>* Pressure ring and case neck.</p><p></p><p>Body support:</p><p></p><p>* Pressure ring to shoulder surface with body resting in a V block.</p><p></p><p>First and last one of the above are shown in:</p><p></p><p><a href="http://s854.photobucket.com/user/unclenickmod/media/RunoutGaugeTypesb_zps6cd0e11c.gif.html" target="_blank">RunoutGaugeTypesb_zps6cd0e11c.gif gif by unclenickmod | Photobucket</a></p></blockquote><p></p>
[QUOTE="Bart B, post: 1148985, member: 5302"] As far as I know, no cartridge spinning tool holds bottleneck cases (headspacing on their shoulder) to measure bullet runout the same way they are held in the chamber when fired. Depending on which one of these different ways the round is supported, you'll get different readings. Two point support: * Pressure ring and right behind bullet tip. * Pressure ring and bullet right in front of the case mouth. * Pressure ring and case neck. Body support: * Pressure ring to shoulder surface with body resting in a V block. First and last one of the above are shown in: [url=http://s854.photobucket.com/user/unclenickmod/media/RunoutGaugeTypesb_zps6cd0e11c.gif.html]RunoutGaugeTypesb_zps6cd0e11c.gif gif by unclenickmod | Photobucket[/url] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
300 Win Mag Build and Loading Questions.
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