Forget the taper crimp in the .480 and get a roll crimp die that will put in a VERY HEAVY roll crimp!
A heavy crimp will increase bullet pull, resulting in better, more consistent burning of the slow burning powder used in this cartridge, and will also prevent bullets from "walking" out of the case and tying up your cylinder.
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If you think a mighty military force is expensive, wait 'til you see what a weak one costs.
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