Large Ring Gauge Punch Cutter

[awsmith4]

This may have been covered before but I couldn't find it. My stepfather has expressed many times how he would like a larger punch. Mikhail (Brian) had sent me some .45 shell casings that are about the perfect size but with the brass being soft and my unskilled hands I could not create a sharp enough edge.

So does anyone know where to find larger punch cutters?

FYI - he smokes mostly 54-60 rg cigars