Did a bit with the 458-300 Win. Case forming was pretty easy, 16 grains of Unique, fill the case with Cream of wheat, plug the neck with wax or soap, chamber and pull the trigger. Fun for blasting grasshoppers at 5-7 yards. Or alternately just chamber 300 Win Mag and pull the trigger. It gives a bit more case capacity than the 458 Win, which comes in handy before most 458 Win loads are more or less all of the appropriate powder you can get in the case without compression levels that cause problem levels of compression. You can shoot them in a Lott as well.
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