The RCBS Supreme Die Set for .300 Winchester Magnum (RCBS part no. 15469) is built for reloaders who don’t want to hunt down accessories piece by piece. RCBS combines a Full Length die set with a shell holder sized to the cartridge and a Chamber Case Length Gauge, so everything needed to size, prime, and load correctly-trimmed .300 Winchester Magnum brass ships in a single box. It’s a practical way to outfit a press for a new caliber without cross-referencing part numbers for the extra pieces most die sets leave out.

Key Specifications

• .300 Winchester Magnum is the chambering this Supreme Die Set is machined for, sizing and seating for .300 Winchester Magnum brass specifically.
• Full Length die set handles resizing and bullet seating so cases chamber reliably and bullets seat to a consistent depth.
• Matched shell holder is included and sized to the cartridge, so there’s no separate part number to track down before loading.
• Chamber Case Length Gauge is included to trim brass to the correct SAAMI length for this cartridge.
• Complete boxed kit means the die set, shell holder, and gauge all arrive together instead of as separate purchases.

Frequently Asked Questions

Does this set include a shell holder? Yes. RCBS includes a shell holder matched to the cartridge along with the full-length dies, so there’s nothing extra to buy to start loading.

What is the case length gauge used for? It’s used to trim brass to the correct maximum case length for this cartridge, which keeps cases within SAAMI spec as they stretch from repeated firing.

Buy the RCBS Supreme Die Set, .300 Winchester Magnum

Order the RCBS Supreme Die Set for .300 Winchester Magnum from our Lubbock, Texas gun shop for fast, insured shipping and pick up the full RCBS reloading dies lineup while you’re at it. It’s a fast way to get a press set up for a new cartridge without piecing together separate accessories.