Rcbs 3-Die Taper Crimp Set - Group C 450 Bushmaster
The RCBS 3-Die Taper Crimp Set for 450 Bushmaster gives you everything needed to load straight-wall rifle ammunition with precision and consistency. Whether you're working up loads for a new AR-platform upper or fine-tuning for your bolt gun, this Group C die set handles the complete reloading sequence—sizing, expanding, and seating—in one matched package. RCBS pioneered the 3-die approach for straight-wall cases, and this 450 Bushmaster set carries that proven methodology forward with hardened steel components built to exacting tolerances.
The sizing die brings fired cases back to specification with proper dimensions; you'll need to lube cases before sizing. The expander die then opens the case to accept your bullet and imparts the slight flare at the case mouth that ensures smooth bullet feeding. The taper crimp seating die completes the cycle by seating the bullet and applying the correct crimp for the 450 Bushmaster cartridge, giving you proper headspacing and a finished round ready for the range or field.
All three dies are machined and hardened to RCBS's exacting standards, so you get the same quality control and durability that comes with every die set from the company that engineered this category. The set ships in RCBS's standard green box and is ready to mount in your press.
Key Features
- Hardened steel sizing die for reliable case resizing (case lubrication required)
- Expander die opens case mouth and applies proper flare for bullet seating
- Taper crimp seating die seats bullet and delivers correct crimp for 450 Bushmaster
- All three dies machined to exacting tolerances and hardened to industry standards
- Matched set for 450 Bushmaster straight-wall rifle ammunition
Specifications
| Brand | RCBS |
| Product Type | 3-Die Reloading Set |
| Cartridge | 450 Bushmaster (Group C) |
| Die Included | Sizing Die, Expander Die, Taper Crimp Seating Die |
| Sizing Die Material | Hardened Steel |
| Packaging | RCBS Green Box |
Frequently Asked Questions
What's included in this 450 Bushmaster die set?
You get three dies: a hardened steel sizing die, an expander die, and a taper crimp seating die. All three are needed to complete the full reloading cycle for 450 Bushmaster ammunition.
Do I need case lube when using this set?
Yes, the sizing die requires case lubrication. Apply lubricant to your fired cases before running them through the sizing die.
What does the taper crimp seating die do?
The taper crimp seating die seats the bullet to the correct depth and applies a taper crimp, which ensures proper headspacing and a finished round ready to shoot.
Is this die set compatible with my reloading press?
This die set uses standard RCBS threading and will fit any press with a standard 7/8"-14 TPI die station. If you're unsure about your press compatibility, consult your press manual or contact us.

