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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: 485892" data-attributes="member: 1521"><p>Woods</p><p>I can't think of an action that would cause expanding brass(thinning) to SQUISH eleswhere.</p><p>Are the new(unfired) neck ODs tapered from mouth to shoulder?</p><p>Then are your formed neck ODs tapered?</p><p></p><p>I ask because I know tapered necks are somewhat common with hunting chambers, and new brass. A taper could allow thicker brass near the shoulders than nearest the mouths, without stopping a pin gauge. </p><p>With this, any outside taper left inward with fire forming might then stop a pin gauge.</p><p>If this is the case and it's an actual problem, I would neck turn before fireforming to control it.</p><p>But otherwise, it's still a mystery to me.</p><p></p><p>Richard, when brass lengthens soley on firing, it's not 'flowing'. It's 'stretching' backward toward the boltface, thinning all the way, and can eventually lead to seperations.</p><p>This is just opposite -in every respect, to what is going on with FL sizing.</p><p>In fact, if anything, this lengthening/thinning would in itself act to reduce an existing doughnut.</p><p>It's when you squish it all back with sizing, from base toward the neck, that brass is pushed that direction.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 485892, member: 1521"] Woods I can't think of an action that would cause expanding brass(thinning) to SQUISH eleswhere. Are the new(unfired) neck ODs tapered from mouth to shoulder? Then are your formed neck ODs tapered? I ask because I know tapered necks are somewhat common with hunting chambers, and new brass. A taper could allow thicker brass near the shoulders than nearest the mouths, without stopping a pin gauge. With this, any outside taper left inward with fire forming might then stop a pin gauge. If this is the case and it's an actual problem, I would neck turn before fireforming to control it. But otherwise, it's still a mystery to me. Richard, when brass lengthens soley on firing, it's not 'flowing'. It's 'stretching' backward toward the boltface, thinning all the way, and can eventually lead to seperations. This is just opposite -in every respect, to what is going on with FL sizing. In fact, if anything, this lengthening/thinning would in itself act to reduce an existing doughnut. It's when you squish it all back with sizing, from base toward the neck, that brass is pushed that direction. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Let's talk about the "dreaded donut"
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