RCBS 09578 Multi-Caliber Stainless Steel Primer Pocket Brush - Small

A clean primer pocket is the foundation of consistent, safe ammunition. The RCBS 09578 Multi-Caliber Stainless Steel Primer Pocket Brush—Small is a straightforward, no-nonsense tool designed to prep your brass for reloading. Whether you're processing range brass or once-fired cases from your own shooting sessions, crud and corrosion buildup in the primer pocket can interfere with proper seating and ignition. This small brush tackles that problem directly, working across multiple calibers so you're not buying a separate tool for every cartridge you load.

The brush features stainless steel bristles that scrub away residue efficiently without damaging the brass. It threads onto an RCBS Accessory Handle—the same handle that accepts other RCBS case prep attachments—so if you're already running an RCBS reloading kit, you simply screw it on and get to work. For reloaders who prep a lot of brass, that compatibility with a common handle system saves both money and space on the bench.

Primer pocket cleaning often gets overlooked by newer reloaders, but it's a step that pays dividends in consistency and reliability. Debris trapped in the pocket can cause uneven primer seating, which affects ignition uniformity—especially important if you're working up precision loads for hunting or target shooting. This brush handles small-caliber primer pockets (as opposed to large-caliber magnum pockets), making it the right choice for your .223, .308, 9mm, .38, and similar cartridges.

Key Features

• Stainless steel bristles for durable, corrosion-resistant cleaning
• Threads onto RCBS Accessory Handle for seamless integration with other RCBS case prep tools
• Designed for small-caliber primer pockets across multiple cartridge sizes
• Quick, efficient removal of primer pocket residue and buildup

Specifications

Frequently Asked Questions

Will this brush work with my RCBS reloading press setup?

The brush threads onto an RCBS Accessory Handle, which is a separate component. If you already own an RCBS Accessory Handle or plan to get one, this brush is fully compatible and designed to work with it.

What calibers does the small primer pocket brush fit?

This small brush is designed for small-caliber primer pockets, which covers the majority of rifle and pistol cartridges—including .223 Remington, .308 Winchester, 9mm Luger, .38 Special, and similar sizes. It is not intended for large-caliber magnum primer pockets (like those in .375 H&H or .338 Lapua Magnum).

How do I use this primer pocket brush?

The brush has a threaded end that screws directly onto your RCBS Accessory Handle. Once secured, you use it to scrub inside the primer pocket of prepared brass cases to remove residue and buildup before seating a new primer.

Why should I clean primer pockets before reloading?

Debris and corrosion in the primer pocket can cause uneven primer seating and affect ignition consistency. Cleaning the pocket ensures proper primer fit and more reliable, uniform firing—especially important for precision ammunition.