- Caliber-Gauge:
- 270 Winchester
If you're reloading for a .270 Winchester in a semi-automatic, pump, or lever-action rifle with a tight chamber, the RCBS Small Base Die Set for .270 Winchester is built specifically for your needs. Standard full-length dies don't resize cases enough for reliable feeding in these actions—that's where small base dies come in. This two-die set resizes .270 Winchester brass below SAAMI minimums, reducing both the shoulder and body by a few thousandths of an inch to ensure your reloads chamber and feed smoothly in tight-tolerance magazines and actions.
The set includes a Small Base Sizer die with an integral Expander-Decapping Unit that removes the spent primer and expands the case neck in a single stroke. This is your first station in the reloading sequence. The second die is RCBS's Regular Seater, which seats your bullet and applies a roll crimp simultaneously—a secured, concentrically seated bullet that feeds reliably and performs consistently downrange. If you prefer to seat without crimping, simply back off the seating die until the crimp ring no longer contacts the case mouth.
Small base dies are essential if you're working with tight-chambering rifles where standard resizing falls short. They're also a smart choice if you're matching dies to a specific gun and want maximum consistency. RCBS has been the reloading standard for decades, and this set delivers the precision and durability you expect—straightforward, reliable, and purpose-built for the job.
Key Features
- Small base sizing resizes below SAAMI minimums for tight-chamber feeding
- Integral Expander-Decapping Unit for one-step primer removal and neck expansion
- Regular Seater die with built-in roll crimp for simultaneous bullet seating and case mouth securing
- Crimp function easily disengaged by unscrewing the die for crimping-free seating if preferred
- Optimized for semi-automatic, pump, and lever-action .270 Winchester rifles
Specifications
| Caliber | .270 Winchester |
| Dies Included | 2 (Small Base Sizer with Expander-Decapping Unit, Regular Seater with Seater Plug) |
| Application | Tight-chamber semi-automatic, pump, and lever-action rifles |
| Crimp Type | Roll crimp (adjustable/disengageable) |
Frequently Asked Questions
Why do I need a small base die instead of a standard full-length die?
Standard full-length dies resize to SAAMI specifications, which may not be tight enough for reliable feeding in semi-automatic, pump, or lever-action rifles with tight chambers or tight magazine tolerances. Small base dies resize cases more aggressively—below SAAMI minimums—to ensure consistent feeding and function in these actions.
Can I use this die set in a single-shot or bolt-action .270 Winchester rifle?
While this set is specifically designed for tight-chamber applications like semi-autos and lever guns, the facts provided address its primary application in those actions. Consult your firearm's specifications and reloading manual for chamber fit confirmation with your specific rifle.
Can I turn off the crimp if I don't want it?
Yes. The Regular Seater die features a built-in roll crimp, but you can unscrew the die until the crimp ring no longer engages the case mouth, allowing you to seat bullets without applying a crimp.
What's included in this set?
The set contains two dies: a Small Base Sizer die with an integral Expander-Decapping Unit, and a Regular Seater die with a Seater Plug.
