Originally Posted by Gunpoor
I have never understood why bullet manufacturers add a cannelure to some bullets. I never crimp case mouths for a turn bolt rifle, and if I did I wouldn't worry about cannelure alignment.
BTW, my Browning A-bolt II in 308 has 0.160" jump to the lands when 165 grain Speer BTSP bullets are seated to max magazine length, but this doesn't seem to detract from the accuracy of it.
Some manufacturers have a functional cannelure by using it as a means to lock the copper jacket to the lead core. ie: Hornady Interlock. Or, other manufacturers have rings to decrease bearing surface. ie: Barnes TSX, Hornady GMX. Others are as you describe with no real reason other than for a crimp groove.
There is nothing wrong with ignoring the cannelure when seating your bullets. I agree it looks funny to have the cannelure that far above the case mouth, but that's about the only negative thing about it.