Use the Lee Cutter and Lock Stud with the Case Length Gauge & Shell Holder to trim cases. Can be used by hand or with an electric drill.
The Large Cutter with Lock Stud is needed for 480 Ruger, 500 S&W and the 50 BMG (for .475" bullet diameter and larger). The large cutter can also be used with all bullet diameters smaller than .475".