
Availability: In Stock
The RCBS 15301 Full-Length 2-Die Set for 300 Win Mag is the foundation of a reliable reloading operation for one of hunting and long-range shooting's most popular magnum cartridges. This matched pair—a full-length sizing die and a seating die—handles the core resizing and ammunition assembly work that keeps your 300 Winchester Magnum brass shooting true and your rounds loading consistent, shot after shot. Whether you're a new reloader building your first setup or an experienced handloader maintaining multiple rifles, a full-length die set is the workhorse tool that'll outlast several barrels on the same gun.
The full-length sizing die does the heavy lifting: it bumps the shoulder back to spec (adjustable via die position), sizes the case body so rounds chamber cleanly, and removes the spent primer in one pass. The expander ball sizes the neck to proper bullet tension. Just remember that cases need lubrication before running through the sizing die. The seating die then seats bullets consistently and includes a built-in crimp ring if you want to crimp the case neck to the bullet—easily toggled on or off by adjusting die height in the press.
RCBS dies are built for precision and longevity. New reloaders benefit most by learning full-length die setup before exploring neck-sizing or other specialized techniques. If you're already running a 300 Win Mag and want to consolidate component costs or reload for multiple rifles, this set gives you the flexibility to work with both full-length and neck-sized brass.
| Brand | RCBS |
| Model | 15301 |
| Cartridge | 300 Winchester Magnum |
| Type | Full-Length 2-Die Set |
| Dies Included | Full-length sizing die, seating die |
| Case Type | Bottleneck rifle |
Yes. Cases must be lubricated before running them through the full-length sizing die to ensure smooth operation and prevent damage.
The seating die will seat bullets in both full-length sized and neck-sized cases. The full-length sizing die itself performs full-length sizing; it can't perform neck-only sizing.
Yes. The seating die includes a built-in crimp ring. You can crimp or skip the crimp by adjusting the die height in your press.
Absolutely. RCBS recommends that new reloaders start with a full-length die set to learn proper setup and technique before exploring other reloading die types.



SKU: 115662161 • Width: 4.5in • Height: 1.7in • Depth: 6in • Weight: 1.31oz





Availability: In Stock
The RCBS 15301 Full-Length 2-Die Set for 300 Win Mag is the foundation of a reliable reloading operation for one of hunting and long-range shooting's most popular magnum cartridges. This matched pair—a full-length sizing die and a seating die—handles the core resizing and ammunition assembly work that keeps your 300 Winchester Magnum brass shooting true and your rounds loading consistent, shot after shot. Whether you're a new reloader building your first setup or an experienced handloader maintaining multiple rifles, a full-length die set is the workhorse tool that'll outlast several barrels on the same gun.
The full-length sizing die does the heavy lifting: it bumps the shoulder back to spec (adjustable via die position), sizes the case body so rounds chamber cleanly, and removes the spent primer in one pass. The expander ball sizes the neck to proper bullet tension. Just remember that cases need lubrication before running through the sizing die. The seating die then seats bullets consistently and includes a built-in crimp ring if you want to crimp the case neck to the bullet—easily toggled on or off by adjusting die height in the press.
RCBS dies are built for precision and longevity. New reloaders benefit most by learning full-length die setup before exploring neck-sizing or other specialized techniques. If you're already running a 300 Win Mag and want to consolidate component costs or reload for multiple rifles, this set gives you the flexibility to work with both full-length and neck-sized brass.
| Brand | RCBS |
| Model | 15301 |
| Cartridge | 300 Winchester Magnum |
| Type | Full-Length 2-Die Set |
| Dies Included | Full-length sizing die, seating die |
| Case Type | Bottleneck rifle |
Yes. Cases must be lubricated before running them through the full-length sizing die to ensure smooth operation and prevent damage.
The seating die will seat bullets in both full-length sized and neck-sized cases. The full-length sizing die itself performs full-length sizing; it can't perform neck-only sizing.
Yes. The seating die includes a built-in crimp ring. You can crimp or skip the crimp by adjusting the die height in your press.
Absolutely. RCBS recommends that new reloaders start with a full-length die set to learn proper setup and technique before exploring other reloading die types.
SKU: 115662161 • Width: 4.5in • Height: 1.7in • Depth: 6in • Weight: 1.31oz


