Description
Prepping brass is where good reloads start, and the RCBS 9304 Case Prep Kit hands you the whole workflow in one box. Instead of chasing down a trimmer here, a priming tool there, and calipers somewhere else, this multi-caliber set pulls together the core tools RCBS handloaders reach for most. It's finished in that classic RCBS green and set up for ambidextrous use at the bench, so it works no matter which hand you favor.
The centerpiece is the RCBS Brass Boss, a six-station case prep station with variable-speed rotating heads. Four stations spin under 350 rpm and two run under 550 rpm, plus two fixed stations handle the case neck brushes. It comes loaded with tools for every station: an inside VLD chamfering tool, an outside deburring tool, small and large primer pocket cleaners, small and large primer pocket uniformers, a military crimp remover for small and large pockets, four case neck brush diameters, and a tub of dry neck lube. There's onboard storage for the tools you aren't using, which keeps the bench from turning into a scavenger hunt.
What the RCBS 9304 Kit Brings to the Bench
Beyond the Brass Boss, you get the Trim Pro-2 manual case trimmer with pilots. Its spring-loaded universal shell holder locks the case in alignment with the cutter, so your trim lengths stay consistent across a batch. A universal case loading block keeps cases upright and organized, and the fold-up hex key set covers your die and tool adjustments.
Measuring and Priming with the 9304 Case Prep Kit
For measurement you get a hardened stainless steel dial caliper with a matte non-glare finish, a 0-to-6-inch range, and 0.001-inch graduations with four-way inside, outside, depth, and step capability. The RCBS hand priming tool seats primers quickly and uses a safety mechanism that separates the seating operation from the primer supply. Rounding it out is a can of Case Slick spray lube to keep resizing smooth. It's a sensible all-in-one for rifle and handgun handloaders who want their case prep sorted from one package.
Key Specifications
- Manufacturer: RCBS
- Manufacturer Part Number: 9304
- Model: 9304
- UPC: 604544657944
- Caliber/Gauge: Multi-Caliber
- Color: Green
- Hand: Ambidextrous
- Brass Boss Stations: Six variable-speed rotating plus two fixed neck brush stations
- Station Speeds: Four under 350 rpm, two under 550 rpm
- Caliper Range: 0 to 6 inches
- Caliper Graduations: 0.001-inch, accurate to +/- 0.001-inch
- Caliper Measurement: Four-way: inside, outside, depth, step
- Length: 13.7 in
- Shipping Weight: 13.615 lbs
What’s Included
- RCBS Brass Boss case prep station with tools for all stations
- Universal Case Loading Block
- Trim Pro-2 Manual Case Trimmer with pilots
- Hand Priming Tool
- Stainless Steel Dial Calipers
- Case Slick Spray Lube
- Fold-Up Hex Key Kit
Frequently Asked Questions
What tools come in the RCBS 9304 Case Prep Kit?
The kit includes the RCBS Brass Boss case prep station, a Universal Case Loading Block, the Trim Pro-2 manual case trimmer with pilots, a hand priming tool, stainless steel dial calipers, Case Slick spray lube, and a fold-up hex key set. The Brass Boss itself comes with tools for all six stations, including chamfer, deburr, primer pocket cleaning, uniforming, crimp removal, and neck brushes. It's a full case prep workflow in one box.
Is the RCBS 9304 Case Prep Kit good for multiple calibers?
Yes. It's set up as a multi-caliber kit, with the Brass Boss handling small and large primer pockets and the trimmer using a spring-loaded universal shell holder that works across cartridge types. The Trim Pro-2 ships with pilots, and the universal loading block fits a wide range of rifle and pistol cases. It covers both rifle and handgun brass prep.
Does the Brass Boss in this kit have variable speed?
It does. The Brass Boss features six variable-speed rotating stations, with four running under 350 rpm and two running under 550 rpm, plus two fixed stations for case neck brushes. That lets you match the speed to the task, whether you're chamfering, deburring, or cleaning primer pockets.
What kind of calipers are included in the 9304 kit?
You get a hardened stainless steel dial caliper with a matte non-glare finish and a 0-to-6-inch range. It reads in 0.001-inch graduations, is accurate to +/- 0.001-inch, and offers four-way measurement for inside, outside, depth, and step. That's plenty of precision for checking case length and trim-to length.




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