The RCBS Small Base Sizer Die Set for 300 Winchester Magnum (Part 15303) is designed to properly size fired cases to a tighter “small base” dimension for more consistent chambering. It’s an ideal choice when you want more reliable feeding and accuracy potential, especially after brass has been fired and resized multiple times.
Key Features
Sturdy case-hardened steel die construction for durable, repeatable sizing
Small base sizing helps ensure consistent chamber fit with 300 Winchester Magnum brass
Set format for full-length small base resizing for reloading workflows
Build more consistent reloads with the RCBS 15303 small base sizing die set built for dependable case preparation.
