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The Range
Ammo & Reloading
Taper Crimp
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<blockquote data-quote="alank2" data-source="post: 1137755" data-attributes="member: 108"><p>Hi,</p><p></p><p>I agree that a taper crimp is what you want for 9mm and 45acp. Roll crimp is usually used for cartridges where there is a cannelure to roll crimp into.</p><p></p><p>My take on crimping automatic cartridges is this: Case tension is what really holds the bullet in place. I only taper crimp them enough to remove the bell used to make bullet insertion easy. This is why I am not a fan of Lee FCD. By sizing both the case and already seated bullet together, I have to think that case-bullet tension is being compromised. This is also why cartridges like 357sig are prone to setback problems - they have very little case-bullet tension area. You can pile them full of a powder that prevents setback, but most manufacturers glue them!</p><p></p><p>Good luck,</p><p></p><p>Alan</p></blockquote><p></p>
[QUOTE="alank2, post: 1137755, member: 108"] Hi, I agree that a taper crimp is what you want for 9mm and 45acp. Roll crimp is usually used for cartridges where there is a cannelure to roll crimp into. My take on crimping automatic cartridges is this: Case tension is what really holds the bullet in place. I only taper crimp them enough to remove the bell used to make bullet insertion easy. This is why I am not a fan of Lee FCD. By sizing both the case and already seated bullet together, I have to think that case-bullet tension is being compromised. This is also why cartridges like 357sig are prone to setback problems - they have very little case-bullet tension area. You can pile them full of a powder that prevents setback, but most manufacturers glue them! Good luck, Alan [/QUOTE]
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