The Lee Precision 6 Cavity Mold .99 Caliber produces a .358 diameter 150 grain round nose bullet suitable. It’s made from aluminum because of the exceptional molding qualities. The mold cavities are lathe bored for unmatched roundness and size control. It will achieve a roundness of .001 or less.WARNING: Melting and casting lead objects will expose you and others in the area to lead, which is known to the State of California to cause reproductive harm and cancer. For more information, go to www.P65Warnings.ca.gov. See instructions on Reducing Exposure supplied with product.