Lee Round Nose Rifle Mould - Double Cavity Handles Included .338in 220 gr. The primary benefit of this mould is the aluminum construction. This material is known for heating up and cooling down fast resists rust and is lightweight. Unlike blocks made from iron or steel known to cause the bullet caster to tire this mould does not have the same effect. Even the block halves are crimped for producing great bullets. Specifications for Lee Round Nose Rifle Mould - Double Cavity: Manufacturer: Lee Fabric/Material: Aluminum Package Contents: Lee Round Nose Rifle Mould - Double Cavity Lee 90372: Round Nose Rifle Mould - Double Cavity Handles Included .338in 220 gr