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Casting custom .303?

Your .303 bullets are probably .300 so you may want to slug your barrel. Besides a casting pot and mold you will need a sizing die and sizer because when bullets drop out of a mold they are not perfect and normally come out big and size to your barrel. You probably will need a custom die to be made for .300 as it is not a common size, especially in the weight range of a pellet.