its a 458 ACCREL from the forum accurate reloading, it is formed from RUM brass and is shortened and improved to give LOTT velocities from a standard long action.
using a magnum bolt face, it is a realy simple rechamber, run thru the sizer trim and shoot to bump out the shoulder and fireform. custom dies from hornaday, and some once fired 300 rum brass, and i was away.
greg
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