The RCBS Neck Expander Plug for .264 caliber (RCBS part no. 39859) is a replacement part for the RCBS Neck Expander Die, sized specifically to .264 case-neck diameter. Swapping in the correct plug lets a single expander die handle expansion and case-mouth flaring in one step, a detail that matters most when reloading cast bullets, where the case mouth has to open enough to accept a soft bullet without shaving lead on the way in. Find it filed with our shellholders & die accessories selection.

Key Specifications

• Expander size is .264 caliber, matching that case neck diameter specifically.
• It is a replacement part for the RCBS Neck Expander Die, not a standalone die.
• Function is to expand the neck and flare the case mouth in a single step.
• It is built for cast-bullet reloading, where the flare has to be right to avoid shaving lead.
• It ships at roughly 0.025 lb, a small, direct-fit replacement plug.

Frequently Asked Questions

What does this plug do? It expands the case neck and flares the mouth in one step, sized specifically for cast-bullet reloading.

Does this include the expander die? No, it is a replacement plug for the RCBS Neck Expander Die, which is sold separately.

Buy the RCBS Neck Expander Plug, .264 Cal

Matching the plug to the bullet diameter is what keeps cast-bullet loading from shaving lead at the case mouth. Order through our Lubbock, Texas gun shop and it ships fast to your door.