Thread: Bullet C.O.L.
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Old October 30, 2011, 03:12 AM   #3
Scorch
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Join Date: February 13, 2006
Location: Washington state
Posts: 11,533
That groove is called a "cannelure", and it is indeed for crimping the case mouth into without damaging or deforming the bullet. You do not need to crimp, but you can id you wish to do so. If you are going to crimp, the case mouth should be about 1/2 of the way up the cannelure. But as Missionary stated, for best results you should find out where your bullets are in relation to the rifling and magazine length.
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