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Ranier specifies that a taper rather than roll crimp is to be used with their bullet. West Coast has a cannelure and they say roll crimp is fine, but do it correctly being careful not to cut the copper.
I use a taper crimp on .38 spl West Coast Bullets copper plated 158 gr bullets. The reason for this is that I bought my dies before contacting West Coast Bullets and have decided that it is nice to be lazy and not worry about case length or cutting copper, having longer case life for the thousands of rounds required for revolver competition, etc.
I've done a run with roll and with taper to test for variations in speed and accuracy and have not yet noted any difference. This testing is limited both in quantity and my skills.
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