This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
An empty bottle-neck rifle cartridge can be easily made into a leather punch by grinding the edge of the opening sharp and cutting a hole near the top in one side. The hole is for removing the leather slugs and should be just a little larger in diameter than the inside diameter of the shell. The cartridges can be had in various sizes and almost any size of punch can be made. - Contributed by Merhyle F. Spotts, Shelby, Ohio.