Thread: Need Help
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Old August 4, 2012, 08:12 PM   #3
m&p45acp10+1
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Join Date: May 3, 2009
Location: Central Texas
Posts: 3,558
Some of the defensive ammo projectiles have a cannulure in them not for crimping, rather for quality control issues. They can see that the bullets are seated deep enough. Some cases have a cannulure in them to show that the powder level is correct. It has more to do with the optical lazer they use as a QC measure.

For cheapo Winchester projectiles I have never seen a 9mm with a cannulure. I have seen the .356 for .38 spcl/.357 mag with the cannulure in them though. I have seen a guy that uses them in 9mm cases for a Ruger Black Hawk convertable.
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