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Rifles, Reloading, Optics, Equipment
Reloading
Let's talk about the "dreaded donut"
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<blockquote data-quote="Mikecr" data-source="post: 485657" data-attributes="member: 1521"><p>SBruce, it happens with 2 events:</p><p>1. Up-sizing necks</p><p>2. Alot of FL sizing, especially on poorly designed cases(like a 30-06)</p><p></p><p>#1 Brass tapers in thickness -thickest near the webs to thinnest at the mouths. With up-sizing you're now turning a bit of thicker shoulder brass into thinner neck area. The same happens with case forming longer necks.</p><p></p><p>#2 FL sizing begins lowest on the case. As the case is further sized it is higher and higher up the case to & through the neck. It's like squeezing toothpaste because down sizing anywhere thickens brass -in a thinner brass direction.</p><p>This is why you have to trim all the time with a 30-06. That toothpaste tube lengthens as the brass slowly works it's way up the case, lengthening them.</p><p>Those with low taper/high shoulder angle cases(AI) trim less because their brass isn't squished so upwardly but more inwardly(has nowhere else to go).</p><p>Those who size a minimal amount either with custom dies and/or with neck sizing only will also reduce the need for trimming. They aren't squishing brass any direction at all.</p><p></p><p>Brass is put where it is by SIZING,, not firing.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 485657, member: 1521"] SBruce, it happens with 2 events: 1. Up-sizing necks 2. Alot of FL sizing, especially on poorly designed cases(like a 30-06) #1 Brass tapers in thickness -thickest near the webs to thinnest at the mouths. With up-sizing you're now turning a bit of thicker shoulder brass into thinner neck area. The same happens with case forming longer necks. #2 FL sizing begins lowest on the case. As the case is further sized it is higher and higher up the case to & through the neck. It's like squeezing toothpaste because down sizing anywhere thickens brass -in a thinner brass direction. This is why you have to trim all the time with a 30-06. That toothpaste tube lengthens as the brass slowly works it's way up the case, lengthening them. Those with low taper/high shoulder angle cases(AI) trim less because their brass isn't squished so upwardly but more inwardly(has nowhere else to go). Those who size a minimal amount either with custom dies and/or with neck sizing only will also reduce the need for trimming. They aren't squishing brass any direction at all. Brass is put where it is by SIZING,, not firing. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Let's talk about the "dreaded donut"
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