DIY: How to make a casting mold from steel? 

What is the casting method in metal mold (Gray mold)? As its name suggests, it is a type of casting that consists of two or more parts of metal molds and has been used for a long time to produce a large number of the same casting part.
Metal mold casting is mostly used for casting parts with complex shapes and narrow dimensional tolerances that need to be produced in large numbers. In this project, I will use this mold to make magnum bullets for my Hatsan Striker 1000s model air rifle.
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