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Zip experience with the .480, but a taper crimp's usually used with a semi-auto (is it? I haven't a clue.) & allows the cartridge to headspace on the brass mouth rather than the rim.
Crimp enough to remove all belling. I take it a tad further & crimp slightly to put the mouth just into the bullet.
Not usually crimped as hard as you would with a roll crimp - different kinda deal.
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