Bullet Swaging Overview
Bullet swaging uses only pressure to form the projectile. Unlike bullet casting no heat is used. The bullet maker uses pressure to force bullet material into a die while one or two punches apply pressure to the bullet. The high pressure causes the material to flow and fill out the shape in the die. Then the bullet is ejected from the die and is ready to use.
There are a great many choices as to how the bullet can be swaged and as to what shapes, materials, and bullet types can be made. This can make swaging sound complicated and difficult but it really is simple once the basics are understood.