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Rifles, Reloading, Optics, Equipment
Reloading
Loaded ammo bullet runout???
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<blockquote data-quote="Bart B" data-source="post: 664658" data-attributes="member: 5302"><p>10 thousandths bullet runout measured at the bullet tip's quite a bit, but entirely possible if the case neck's bent out of alignment with the case body axis. I've seen that happen when expander balls have to move a lot of brass sized down quite a bit in a FL die.</p><p></p><p>Bullet runout measured right in front of the case mouth with the case pressure ring in a V block and bullet tip held in a dead center will be less than if the case pressure ring and bullet right in front of the case mouth are in V blocks and the dial indicator on the bullet about 1/10th inch back from the tip.</p><p></p><p>The best runout readings on bottleneck cases that headspace on their shoulder happens when the case pressure ring rides in a V block and the case shoulder datum point spins in a dead center with the dial indicator on the bullet about 1/10th inch back from the tip. Such cases align themselves in the chamber this way when they're fired; pressure ring's against the chamber wall opposite the extractor and the case shoulder's perfectly centered in the chamber shoulder from firing pin impact. I've oft times thought about making some drawings showing how a bottleneck case held different ways in a runout guage gives different readings for the same loaded round whose bullet axis is 1/6th degree off the case body axis.</p></blockquote><p></p>
[QUOTE="Bart B, post: 664658, member: 5302"] 10 thousandths bullet runout measured at the bullet tip's quite a bit, but entirely possible if the case neck's bent out of alignment with the case body axis. I've seen that happen when expander balls have to move a lot of brass sized down quite a bit in a FL die. Bullet runout measured right in front of the case mouth with the case pressure ring in a V block and bullet tip held in a dead center will be less than if the case pressure ring and bullet right in front of the case mouth are in V blocks and the dial indicator on the bullet about 1/10th inch back from the tip. The best runout readings on bottleneck cases that headspace on their shoulder happens when the case pressure ring rides in a V block and the case shoulder datum point spins in a dead center with the dial indicator on the bullet about 1/10th inch back from the tip. Such cases align themselves in the chamber this way when they're fired; pressure ring's against the chamber wall opposite the extractor and the case shoulder's perfectly centered in the chamber shoulder from firing pin impact. I've oft times thought about making some drawings showing how a bottleneck case held different ways in a runout guage gives different readings for the same loaded round whose bullet axis is 1/6th degree off the case body axis. [/QUOTE]
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Reloading
Loaded ammo bullet runout???
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