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I agree with cheygriz, the .480 rounds should be roll crimped.
I've used a taper crimp on 357, and even 45 Colt, but only for low to medium power loads, and only when using bullets without a crimp groove.
The crimp groove is there for a reason, one of which is showing you the proper bullet seating depth for that particular bullet!
Your seating die should have a roll crimp shoulder inside, and setting the die adjustment is pretty easy on a single stage press.
Ask if you need instructions, but I've only done this on my single stage press, so setting up the AP is going to be complicated a little by the moving shell plate. Someone else with L-N-L AP experience may want to jump in here.
Bill
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