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Rifles, Reloading, Optics, Equipment
Reloading
Clean inside case neck ?
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<blockquote data-quote="Pdvdh" data-source="post: 1341860" data-attributes="member: 4191"><p>Here's one example, not quite so extreme, which amps up the bullet to case neck friction tremendously. Crimping bullets into crimp grooves on non-lubed bullets and non-lubed case necks. Or even crimping without the crimp groove (cannelure), using the Lee Factory Crimp Die.</p><p></p><p>To my way of thinking, crimping increases friction much more than neck tension, because only a small section of the mouth of the case neck is crimped.</p><p></p><p>We know crimping can have a very notable affect on powder ignition rate, and bullet precision, compared to non-crimped bullets. </p><p></p><p>So if case neck tension is the overwhelming (as in sole) cause controlling internal case pressure prior to bullet release, and friction plays an insignificant role, I wouldn't expect crimping to induce such a large affect on internal ballistics and bullet precision.</p><p></p><p>Lots of factory ammo is crimped, and one of the most common explanations heard is that it provides a more consistent powder burn rate, by increasing the internal case pressure prior to bullet release.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1341860, member: 4191"] Here's one example, not quite so extreme, which amps up the bullet to case neck friction tremendously. Crimping bullets into crimp grooves on non-lubed bullets and non-lubed case necks. Or even crimping without the crimp groove (cannelure), using the Lee Factory Crimp Die. To my way of thinking, crimping increases friction much more than neck tension, because only a small section of the mouth of the case neck is crimped. We know crimping can have a very notable affect on powder ignition rate, and bullet precision, compared to non-crimped bullets. So if case neck tension is the overwhelming (as in sole) cause controlling internal case pressure prior to bullet release, and friction plays an insignificant role, I wouldn't expect crimping to induce such a large affect on internal ballistics and bullet precision. Lots of factory ammo is crimped, and one of the most common explanations heard is that it provides a more consistent powder burn rate, by increasing the internal case pressure prior to bullet release. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Clean inside case neck ?
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