Check the listing for details. Lee Precision 50Cal 320RB Double Cavity Mold. Color: Black, Condition: New. Listed at 41.34 USD. Lee Precision 50 caliber 490 Ball Double Cavity Bullet Mold is a great choice for reloaders looking for a quality mold at an affordable price. Lee machines their mold blocks from aluminum making them rust resistant. Aluminum molds heat up and cool down faster than iron or steel molds and good bullets can usually be produced only after a few casts. In addition, aluminum blocks are one-third the weight of iron or steel mold blocks offering the bullet caster less fatigue during extended casting sessions. To ensure the best possible bullets, mold block halves are CNC machined for unmatched roundness and size control. Weights given are Lee weights with suggested alloy. Actual weight may vary due to the alloy mixture used. This mold will cast one R.E.A.L. bullet and one round ball bullet. R.E.A.L.