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The Range
Ammo & Reloading
Oysters on the half shell...
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<blockquote data-quote="MBB" data-source="post: 838117" data-attributes="member: 2658"><p>Holy smokes! .45ACP headspaces off the case mouth. A firm roll crimp will screw up the headspace and create excessive space behind the casing. The casing will fill that space when firing. That's why the casing split along its circumference: it stretched too much. .45ACP should have a slight taper crimp. Really all the "crimp" should do is straighten the case walls that were belled after expanding to allow the bullet to seat. There should be no "roll" in a .45ACP crimp.</p><p></p><p>-MBB</p></blockquote><p></p>
[QUOTE="MBB, post: 838117, member: 2658"] Holy smokes! .45ACP headspaces off the case mouth. A firm roll crimp will screw up the headspace and create excessive space behind the casing. The casing will fill that space when firing. That's why the casing split along its circumference: it stretched too much. .45ACP should have a slight taper crimp. Really all the "crimp" should do is straighten the case walls that were belled after expanding to allow the bullet to seat. There should be no "roll" in a .45ACP crimp. -MBB [/QUOTE]
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