The RCBS 30207 22 ARC Small Base Taper Crimp die set is purpose-built for reloaders working with AR-platform and semi-automatic rifles chambered in 22 ARC. If you're pushing consistent, reliable ammo through an AR, this two-die set addresses the real-world challenges that come with autoloader brass—tight chambers, variable case lengths, and the need for dependable feeding shot after shot.
What makes this set different from standard dies is the engineering behind each tool. The small base sizing die takes your fired brass down to dimensions that guarantee reliable rechamber in your rifle, eliminating the frustration of rounds that won't chamber cleanly. The taper crimp seating die is the other half of the solution: it handles the inconsistencies you get when loading mixed-length cases in a single session without the risk of neck bulges or buckled shoulders that can plague standard crimping. When you're using cannelured bullets—common in 22 ARC ammunition—taper crimping shines by providing a crimp that's forgiving across slight variations while staying secure.
This is a 2-die set, so you'll need a shell holder and progressive press setup to maximize its potential. The set works with shell holder #32 and shell plate #32 (sold separately), making it compatible with RCBS standard equipment. If you're running a progressive press and loading volume matters, this die set cuts the fuss and improves consistency compared to full-length sizing alone.
Key Features
- Small base sizing die ensures reliable rechamber in AR-platform rifles
- Taper crimp seating die minimizes neck bulges and shoulder issues across varying case lengths
- Optimized for semi-automatic and AR-style rifles in 22 ARC
- Two-die set format supports progressive and single-stage loading
- Works with RCBS shell holder #32 and shell plate #32
Specifications
| Product | RCBS 30207 22 ARC SB T/C Die Set |
| Cartridge | 22 ARC |
| Die Quantity | 2 |
| Included Dies | Small Base Full Length Sizing Die, Taper Crimp Seating Die |
| Compatible Shell Holder | #32 (sold separately) |
| Compatible Shell Plate | #32 (sold separately) |
Frequently Asked Questions
What is a small base die and why do I need it for my AR?
A small base die sizes fired brass down to tighter dimensions than standard dies. Since AR-platform chambers are often tight, small base sizing ensures your reloaded rounds will chamber and feed reliably without having to manually work each case. It's especially important if you're loading for an autoloader where function is non-negotiable.
What's the difference between taper crimp and standard crimp?
Taper crimping applies a gentle, tapered compression to the case neck rather than a sharp roll crimp. It's more forgiving when you're loading cases of slightly different lengths—common when you're working with mixed brass from range pickups or multiple shooting sessions. It also eliminates the neck bulges and buckled shoulders that standard crimping can cause, particularly when using cannelured bullets.
Do I need to buy anything else to use this die set?
Yes, you'll need a shell holder #32 and shell plate #32 (both sold separately) to use this set with your press. You'll also need a reloading press compatible with RCBS standard tooling, appropriate brass, bullets, powder, and primers.
Is this set suitable for both single-stage and progressive presses?
The die set is a two-die configuration that works with RCBS standard equipment, so it's compatible with both single-stage and progressive presses that accept RCBS dies and tooling.
