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In general, IF you are going to crimp, I'd say use a factory crimp die. That way there's no chance of pushing back the shoulder of a bottlenecked cartridge and collapsing it when crimping. That seems to be a common problem faced by new reloaders from what I've read. In general, most handgun cartridges are crimped, and rifle cartridges used in some autoloaders require a crimp, but not all.
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