RCBS Neck Expander Plug Features The RCBS Neck Expander Plug for .338 Cal replaces the expander component in a compatible RCBS Neck Expander Die restoring consistent neck expansion performance as original plugs wear. In a single stroke the plug both expands the case neck to the correct diameter and flares the case mouth preparing the case to accept a cast bullet without shaving lead from its surface. This two-in-one action saves a separate flaring step that would otherwise be needed when loading soft unjacketed cast projectiles. Getting this step right is one of the most important parts of producing accurate reliable cast bullet ammunition. RCBS manufactures these plugs across a wide range of dimensions to match different bullet diameters and this version is sized specifically for .338 caliber bullets. Because the plug is a precision-fit replacement part rather than a full die reloaders can restore worn expander performance economically rather than purchasing an entirely new die. Cast bullet shooters in particular depend on properly sized expander plugs to avoid bullet damage during seating. Reloaders working up .338 caliber cast bullet loads will find this plug a practical focused upgrade for their existing RCBS die. RCBS Neck Expander Plug Specifications Manufacturer: RCBS Model: Neck Expander Plug Caliber: .338 Cal Available At: GrabAGun