If the bullet has a crimp groove , roll the crimp into the groove .

Coated bullet ... Adjust the crimp so it does not damage the coating .

If the bullet is smooth sided , no crimp groove - no cannelure then taper crimp and adjust die not to damage coating .

Heavy revolver bullets and heavy loads in revolvers do best with a roll crimp ... it is more secure .
If you must use a taper crimp make sure the bullets do no walk forward during recoil ... taper crimps on coated bullets sometimes do not hold as well ... you are limited as to how much crimp can be applied because of the coating and the coating is slick and hard to hold .
Load your revolver with 6 shots , fire 5 and examine the last round to see if the crimp holds .
Gary

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Certified Cajun
NRA Member